First of all (i dunno how much you were active lately, but i didnt seen you often around here) we are unable to even agree what is "bad feature" ...
And second ...
I believe that its up to the development team change/erase those systems THEY are not satisfied with ... sure we can say wich and why we dislike ... and then its up to them if they double check it if that is working as it should, or if there is any way to make it better, but in the end its still their (basicaly Swens) decision.
You know ... to explain this, i believe that i dislike this modern "im a customer and i dont like this, so they have to change it" kind of mindset, exactly as you dislike that "if you dont like it, dont use it" argument ... there is no way to explain it fully, at least not for me with my poor english skills.

The feeling is simply just right there, once somebody brings that up.

I was pretty active at the start (until patch 4) but, since the number of new things was inevitably decreasing, nowadays I limit myself to watching the threads without commenting on them, except for rare occasions like this one.
But to reply to your point: I hadn't a gun pointing at me when buying the EA of the game, I know I'm not entitled to anything, let alone to tell the developers what to do with their game.
Still, Larian asked people to buy the EA to give them feedback (and money, but I think they were genuinely asking for feedback), so, feedback I'm giving them, like any of us here. If I think a feature is bad for the game, I'm going to say it without ill intent, but because I really wish for the game to succeed. Larian can do whatever they like with my opinions

Every game can be exploited ...
Maybe except old school things like Pacman, Sonic or Tetris.

But i dont believe this even "is" a problem ... exploits are things people do purposefully, and willingly (never accidentaly) ... so as long as you avoid them, there are none for you.
I cant help the feeling that we have different deffinition of "immersion". O_o
I mean ...
How can you "break" out of immersion by something that is system-mechanic ... and therefore it dont even exists, from story (in wich you are immersing) perspective? O_o
Because, even ignoring the "exploitable scapegoat" part of the problem, I know I have the power to do something that my character shouldn't be able to (teleport from anywhere) and that doesn't make sense with the IG lore.
If I'm paying 59+€ to play an RPG based in the forgotten realm I don't want to force myself not to use (bad) game features in order to have a coherent experience.
And I'm not saying it like "it's my personal taste and I want it that way". I'm saying it because it's the foundation of what constitutes an RPG experience.
I experienced enough by walking there, i see no reason to walk back just to someone else feels happy about the way i enjoy the scenery.

...
In this case i would quote Auntie:
Im affraid thats my business petal.

I must be honest, seems to me that you are really trying to be provocative in your posts and I don't find it very nice, since it is dismissive of the other person's argument.
But maybe I'm reading it the wrong way and you have no ill intentions, in that case, I apologize.
I'm not saying that you should go play an arcade game instead of an RPG, but genres exist for a reason. They are categories personifying a well-defined set of rules and features, and people have all the right to complain if what was advertised as a particular type of game has features and mechanics detrimental to that same category.
Since the main reason RPGs are RPGs and not Action Adventures or RTS games is the immersion factor, a mechanic which breaks immersion is a bad mechanic and should be changed, or, at least, the developers should contemplate the possibility of changing it.
to quote Maximuus
Because role playing games usually have a coherent visual and narrative layer upon the "system-mechanic".
Immersion is the core purpose of role playing and such flaws in the systems break the immersion in "the experience" as a whole.
And there is no arguing about the fact that fast travelling anywhere, in BG3, is an immersion-breaking feature for many people (this thread has plenty of them), even if one chooses not to use it.
I played dozens of RPGs, Action RPGs and cRPGs and the episode I mentioned in my first post was one of the most annoying and immersion-breaking I have ever experienced. It's indicative of a problem, it's a fracture in the silent pact that ask the player to suspend its disbelief, and it's not good in this type of game.
If, while playing LA: Noir, a button on the top right of the screen says "shove a banana up your butt", I suspect no one is going to particularly enjoy the cathartic revelation of the case, even if they choose not to press it.
Not to mention that I think no one is asking to remove fast travel completely, just to make it coherent with the in-game lore and balanced in terms of mechanics, which basically translates in "make fast travel unavailable in enemy territory" or in "make fast travel only available if you touch a portal" if we want to be coherent with the worldbuilding.
I really don't think this is too much to ask for.
Disabling this option is just a string of code, and I'm more than happy if Larian chooses to put a "no fast travel limitation" option on the settings menu, maybe when choosing the game difficulty.