This is the concern, really. They start building on a shaky foundation of bad homebrew and then keep adding to it, getting further and further away from D&D.
When they should simply offer an authentic D&D experience (mechanically) and build on that. I am by no means any kind of a rules purist, but I have read the 5e rules because of BG3. Larian are like a bull in a china shop with D&D. Breaking the game with reckless changes is not going to be "better" or "fun". It feels like the changes always stem from a personal preference rather than player feedback or experience with the D&D system, or necessity for a video game.
What even is an "authentic d&d experence"? Rulesets change all the time and the creaters openly promote homebrewing. The rulesets are imperfect things that get changed up and homebrewed all the dang time, see varient human.
2 diffrent games set in the forgotten realms could play almost entirely diffently depending on when they were made.
As far as I can tell a lot of the changes seem to be matching what Wizards of the Coast are doing with the next generation of D&D releasing next year. So it seems to me like WotC are likely involved in some capacity in how the rules are handled when deviating from 5e and I very strongly suspect they want BG3 to reflect as much of the next gen player handbook as possible. The problem I have there is I have no faith in what WotC are doing as some of the early changes they proposed were catastrophically bad and worse they want to say the next generation of D&D is backwards compatible with 5e...they're not even willing to leave 5e alone. The next gen rules are still being tinkered with all the time and BG3 launches in the middle of that so it will probably end up in a weird limbo where the final product is neither 5e nor 6e.
