Meh. Frankly your points are either just plain wrong, caused by Larians implementation, or pretty irrelevant in the bigger picture.
D&D is an excellent rulesystem that provides an enormous depth, flexibility, and balance, after it was finetuned over 50 years by very talented people. Its main strings here are really the company attached. You dont get full control of what you're going to do when doing a D&D game. Larian was told they have to make a mind flayer game. The only other problem of D&D is that its designed for tabletop, so there are restrictions to what can be done. All computations have to be designed in such a way that people can easily do them by hand.
But yeah Larian is moving on. If they can get their own rulesystem working with compareable quality, nobody will complain, least of all me. I strongly doubt they can though. The only rulesystems I know that can really compete with D&D are MMORPG ones that have been tuned and tuned again over years by the developers. There we have some that work really well, like World of Warcraft or VSoH. Of course even there some games are hopeless, too.
But selfmade rulesystems for non-MMO roleplaying games, like for example in Dragon Age: Origins (I didnt care for any for the followup games either, so I havent played them) or The Elder Scrolls more often than unfortunately just plain suck.
About TES alone, I could make a wall of text about the many fundamental design errors in TES which make these games a total PITA to play. The whole idea of monitoring the players every action is fundamnentally wrong and retarded. Just because my mage uses a bow every once in a while doesnt mean he ends up a master archer in the end. Thats fundamentally inbalanced by the very design, and only the first really retarded problem of the whole system. And the rulesystem is really primitive. Before TES V Skyrim offered only three classes really, and nothing would stop you to get all three combined either. Even with Skyrim you can still get every feat in the game, but at least now you have to really work hard on that; before it was basically automatic. The magic system is absolutely minimal and really just has a couple of damage types that all work the same way and very few effects that are actually original. D&D is of course loaded with original spells, so much so that Larian refused in BG3 to implement higher than tier 6, because too complicated. Etc.
Some of these systems work okay. Like the SPECIAL system for Fallout. Not as good as D&D, sure, and quite limited in regards to archieved balance (some characters are much stronger than others), but fundamentally balanced in its design principles and perfectly fun to play. I dislike Fallout for other reasons - the whole idea of a postapocalyptic game world is simply too depressing for me. I far prefer a fantasy, steampunk, or science fiction setting. Although of course post apocalyptic is considered a variant of science fiction, but I rather want a more positive one, like Star Trek or Star Wars.
So yes I hope Larian will find good new rulesystems that are fundamentally fun to play. I havent played their other games so I dont know what the status there is. I hear they have the physical stuff they have in BG3 there, too. That alone is too gimmicky and doesnt really attract me though.
