If you are diabetic, you just ask for you folks to not leave a chocolate bar on your bedroom. You do not act like if this would be ok just because you can "Self-Moderate".
But if they leave a chocolate bar on your bedroom ... and you ate it, even if you know you should not ...
Is it their, or your fault, that you will get glycemic shock?

I say its yours.
A friend of my was recently playing a game WT3, and he complained to me that the game was just to easy... so the solution he had was to play all of it without armor, sacrificing a big part of his immersion to make the gameplay pleasant. Do you think he was ok with that? He wasn't!
I dont even know what WT3 is.

But it was his decision ... if he was unhappy with it, it was probably poor decision.

Simmilar to people who learn all Cleric spells with their Wizzards, and then are unhappy with the fact that they in fact have two Clerics in party, of wich one have really poor defences.

It's not the players obligation to "moderate"/"Balance" the game.
I would say: Their loss.

That is why "difficulties" are implementes as well as "Toggle features" so everyone finds an "reasonable" balance (IF he wan't to), of course, some people just wan't to experience the story.
Sure ...
But if you scratch half the rules, bcs "you dont like it this way" ... people who would like it, have no way to as you say "finds an reasonable balance".

That is why i say, every time you wish to complain about it ... ask yourself what will happen, if you simply stop doing it ...
If you are hitting the wall, with your forehead ... it will hurt ... you dont need to tear down the wall, to stop that pain ... you just need to stop hitting it with your forehead.

:-/
Adding more on the matter, using Self-Moderation as an argument to not balance something would work on so many aspects that the company could just forfeit this part of the development and just say "Be moderate people".
Yes, it would ... and i cant help the feeling that is often even SHOULD ...
You know the problem here is that you are not tuning the game just so it perfectly fits to yourself ... you (well, actualy Larian do, but you get the point) are tuning it for millions of other players.
Some of them might like the fact that their Wizard can easily heal when they get to tight situation ...
Once you are using self moderation, it this specific matter ... you get the experience you want, and they get th experience they want > everyone happy.
Once you are restricting the rules, so Wizzard cant use anything exept their own spells (no matter how "right" that is in DnD) ... you get the experience you want, but they are no longer able to. :-/
I just cant see that as good design for everyone. :-/
This aspect, IMO, it's not about liking or not. I dislike weighted dice, so I just turn it off
Congratulation.

You just used basic self-moderation ... you determined what you dont like, and didnt use that ...
This case is completely different, because it does break it.
How? o_O
I mean, i get that people are complaining here about High Ground advantage ... bcs even if you self moderate as hard as you can, there is no possible way to stop NPCs to get that advantage, wich is understandable source of frustration (and will be even more, once Larian adds some Rogue NPC, that will actualy use Sneak Attack

).
This i can understand.
But there is no NPC in the game, that would use Cleric spells, while being Wizzard ... the only one who can do this is you, there is litteraly nothing that is forcing you to do that (and also nothing stopping you) ...
How possibiliy "breaks the game" ?
If you do it, and you use it ... YOU are the one who is breaking the game, simmilar as if you are using exploits ... and if you dont like it, i honestly cannot understand why you did it. O_o
I mean, dont get me wrong ...
But using exploits is, by my own point of view, compareable to using cheats ... yes, the game can easily become boring if you do ... so, i would not recomend it, but if you wish ... its your choice, and your consequences. :-/
Make me remember a tactical game of a mutant party that the game was completely unbalanced with only few characters been really good and the others trash.
That is not adequate comparsion ...
For one, i dont even know what game are you talking about, and i doubt i played it anyway ...
For two, another game means another rules, wich makes it kinda irellevant to this case ...
And finaly, even if you would demand to use it as example, the game would need to be closer to BG-3 situation ... and that would mean that some characters would need to have OPTION to become POTENTIALY much more powerfull compared to others, but game should be still perfectly playable with anyone with regular power level.

About you creating 4 rogues......, yeah, there is nothing stopping you from that but then it just wouldn't be an exploit.
Hiding against every single attack?
I bet majority of people around here would see it as pure exploit and almost nobody would say "oh yeah, that is just clever use of totally regular abilities"

The problem is not the feature/possibility of sneaking and then attacking, the problem is making this for everyone, that is "hurting" the rogue in the same way that giving wizards every spell on the game are hurting Clerics/Druids/Warlocks etc.
But removing it would "hurt" the other classes aswell ...
If i create dexterity based, light armor wearing Fighter ... why should i be less stealthy then a "rogue" ?
If i create dexterity based, light armor wearing Ranger ... why shouls i be less stealthy then a "rogue" ?
etc.
Also, the hurt from Wizard is still not so hard as i see it ...
Cleric still have chanel divinity, that Wizard cant aquire by any means.
Druid still have his Wild Shapes ...
Warlock still have eldrich invocations ... and as far as i know, there is still no way to get Eldrich Blast.
Yes, by the fact that Wizard is POTENTIALY able to learn litteraly any spell he can find on scroll, the caster classes are much closer to each other than in tabletop version ... but that is the only effect it actualy have. :-/
I would never call that gamebreaking, especialy since all you need to do to prevent that, is simply stop doing it.