Larian Studios

Haste simply wasn't designed to give you +1 action in tabletop, like it does in BG3 (on top of +2 AC, double movement and advantage on dex saves). It gives you a special "Haste action" that you can use to Dash, Disengage, Hide, Obect Interaction or make 1 weapon attack. It can't be used to cast spells and it doesn't work with features that give you additional attacks. I think people mention Haste so often because it is such an obvious case of maknig an effect too strong relative to what it is expected to be, especially how easy it is to get your hands on a stack of Haste potions early on since Hyena Ears (dropped by gnolls) are the main ingredient. It's the tip of the iceberg that everyone will notice almost immediately.

Another interaction that might go a long way to balance some parts of the game is to simply enforce the 1 levelled spell per turn rule from tabletop. You toss a Fireball? It doesn't matter how many actions or bonus actions you have, you can only use cantrips until your next turn, unless it is on your reaction. You needed to Misty Step away? Only cantrips for you the rest of the turn. Etc.

I don't think bringing monsters up to where the game is currently allowing players to go would be the solution, because that would make a lot of characters just flat out unviable because they're not designed to deal with that environment. And it would be unreasonable to expect your random player to be able to optimize for that environment, or even want to. I certainly would lose interest quickly if I couldn't make the roleplay characters I wanted. Instead, fixing a lot of the broken interactions and mechanics to bring the ceiling down a bit, then adjust higher difficulties for that new ceiling is what I think would be the best solution.

I don't understand your argument.

To be fair, you CAN casts 2 spells in a single turn, but only if you didn’t use bonus action. Per tabletop.

So normal wizard could cast fireball and a counterspell, while sorcerer casting quickened fireball could only cast cantrips at that point. It would still fix the massive abuse for sorcerer and should be also applied to all martial. It’s stupid that you can use 3 bonus actions to make 3 additional attacks.

You don't need to sacrifice any lvl to cast 3 fireballs w/o haste.
There are items beyond every imagination. That can give bonus action. So with a single class. Yes for sure if we start to do multiclassing and use haste it's possible to shoot even 6 fireballs at one turn. But it's just 1 fireball from 6!

You asked why people mention haste all the time. I gave you the answer: It is the tip of the iceberg of broken mechanics you don't need to know much system familiarity to see.

I was comparing to tabletop. The thing I said about Action Surge being the only way to cast multiple spells in a single turn is how it works in tabletop, which does require 2 lvls of Fighter.

That is what I am saying it no just one spell. It's almost everything that a smart person can come up with.

I think the most broken spell is darkness but nm.

And worth noting that is more costly in tabletop, while, if not playing a module, offers less benefit than the numbers would indicate. The MC requirement of 13 dex (or str) most likely isn't so bad, but it does mean you're 2 levels behind, which means you're behind a full spell level. Second to that, the DM is going likely to tailor the fights to your party's capabilities. So even if you could abuse haste like you can in BG3, the encounter difficulty would increase to compensate (and enemies would use it on you too). The third is that BG3 has set encounters, and there is sufficient xp to be had from those that you can easily over-level the encounters. And you get xp after xp. In tabletop, progress will be much slower, and you're looking at a long, long time to get to the levels we get to here very quickly. And fourth, you can't respec for a pittance, and typically not at all. So if you want those levels of fighter, and you want the con proficiency save bonus, you have to start as fighter, and won't get to do mage stuff until level 3, at which point you'll only have level 1 spells.

So even outside of how the MC works for just your build, just the nature of playing in real life makes MC'ing a lot less appealing.

Also beyond that, a lot of MC'ing also abuses rest mechanics. Just short rest, get your Warlock spells back and smite some more with your paladin/warlock. Well, a short rest is supposed to take an hour. Meaning you can't do that after taking out one room in the Gith creche, for example, because they'll attack you. But in game, it is instant. This even applies to action surge. You can use it and then long rest afterwards. Tabletop, no such guarantee.

There is difference between making things easier and totally breaking the game. Any good build should make the game easier by default, that's the idea behind making a build, I'm not going to nerf myself. However, when a few items get you to the point, that you could just skip combat, because there is no chance of you ever losing, then the game is badly balanced. A bad balancing kills a main reason for buying the game in the first place, exciting and challenging combat. No challenge no fun.

And that's the tip of the iceberg. How is game supposed to be hard, when you can stack the odds in your favour so damn much? Let alone with things such as broken Haste, etc.

This is a tough road to walk. How do you make a game easy enough for causal play and tough enough for the purists?

Then the whole balance issue which is a mess because of the desire to use as much DnD as you can. DnD is designed around the use of an active GM, someone that can tweak things on the fly and make snap decisions with an unforeseen player action could rerail everything. With a CRPG there is simply no way to do this short of putting limits on player actions.

While, as a DnD old school fan boy purist, there is much I would like to see changed, on the whole I think Larian did a good job of walking the line and making the game accessible to all levels of skill and interest.