1.) A main argument for turn-based is that Larian wants to emphasize multiplayer, for which turn-based is much friendlier than real time with pause.
2.) ...cube?
3.) So you want a higher chance to hit the enemy? That's not an uncommon complaint, but I doubt there's that much difference between BG2 and BG3 to-hit chances. You probably just noticed missing less often in BG2 because RTwP happens faster. In BG3, make sure you're getting Advantage from high ground and backstabbing. These will massively increase your chances to hit.
4.) Agreed. It'd be nice to have the option for 5 or 6 party members.
6.) Agreed. There should be less magic items, particularly in shops. The weird magic items we find while exploring are fine, but the prevalence of straight upgrades (+1, magic missile amulet, etc) should be common only later in the game.
7.) Disagree. In fact, I think we reach level 4 too quickly. In particular, almost no time is spent at level 2. Lockpicking could grant experience though.
8.) Not sure what you're talking about here. Help or Knock Out? If the former, then the Help action is used to help an ally that is prone, unconscious, or entangled. I think it works properly, but there's no reason for it to be used on an enemy goblin. If the latter, then yes the knock-out non-lethal option needs to be fixed to actually work properly. Notably, enemies you knocked-out need to become non-hostile to you. Or at least there should be a check to intimidate/persuade them.
10.) ...if you played BG2 then you should be familiar with the D&D class system?? Choosing a class is one of the first things you do in character creation and it governs what abilities you get. Multiclassing (if it's implemented) should allow you to play that thief-druid.
11.) Agreed Inventory management is one of the most widely disliked things in BG3.