2) Translating the turns into real time makes since given that this is a video game. You can't have a DM shout all enemy actions at once given that it is... well, impossible. You also can't have all of the players shouting what they want to do given that it would be... well, stupid. But you must realize that those combat encounters would nevertheless happen in real time. The turn based system exists in table top due to the limitation stated above, it is merely a workaround for an impossible situation trying to simulate what would happen in real time. So, now that we have computers which are actually able to translate simultaneous enemy AI commands as well as that of your companions and your own... we shouldn't use this improved system because on a limited system it is not possible? It's dumb.
In regards to your point of the characters swinging once and then standing still (first of all this is pretty much beside the point but whatever), well, you won't say that if you have an improved haste berserker dwarf hacking away at something I'll tell you that right now xD But by that logic it is much more retarded to see an entire party stand still and look as one of your companions get completely mauled by several enemies while standing there doing nothing and the companions also doing nothing (poor teamwork if you ask me lol).
Your argument that turn combat is what D&D rules are made for... well, once more it's due to the limitation I already described, and regardless of that the original BGs had the turn based combat implemented. The entire game is turn based. It is simply shown to you in real time to have a better flow of the game, a greater feel of excitement and epicness as you can actually see the battle unfold, hear the warcries, the spells going off, the hits, etc. Turn based in BG3 is reddit or a stream, because I'll just alt tab while the AI are doing their stuff to prevent closing the game out of boredom.
2) Wrong. It is as if you're trying to make a real time strategy game based on chess rules. It doesn't work period. Yes BG was better than real-time chess, but you get the idea.
Besides, why stop at BG level of computerization? Let's go crazy, use dice roll of 1,000 not d20, allow the decimals and smaller numbers too : 0.1 damage, 1.12 attacks for seconds, etc. Ability score of 12.4, etc. Because you can with computers...
Keep doing it, and you pretty soon end up with something that has nothing to do with DnD.
Also btw, in turn based games, your brain accepts that the other pieces remain still. That magic doesn't work in real time game. At least that's for me and I'm sure I'm not alone.