They will need to add new content to keep us playing to and get our feedback. Dataminers tell us that Act 1 is split into act 1a and act 1b and that content is added to 1b with each patch.
You want to follow 5e rules more closely, then don't eat a cheese wheel as a Bonus Action to heal HP. Be your own DM and set your own rules for yourself that are more in line with how you play D&D 5e. Don't think throwing barrels around at enemies is unbelievable? Don't throw barrels around at enemies. You think it's wrong to allow Astarion to use Dash as a bonus action and then Dash again as an Action and then Dash again as a second Bonus Action, don't use that extra Dash.
That is how a play. But it leads to a diminished experience. No dipping (lol), no food, no jumping in combat etc. I do drink potions as a bonus action and I think pushing and dropping items is true to 5th ed.
But. Because disengage is 'jump' I can't really play a 5th ed rogue. A 5e rogue can enter combat, strike, disengage and hide behind the party tank. Rise and repeat. It's a really devastating strategy. Rogues can also do more in a round than any other class. To do the same with as Astarian isn't fun. You go in, strike, jump etc. But that's boring because a) it's something any class can do b) it's immersion breaking. Jumping over someone's head should be a class feature of a bard-acrobat or some school of monk. When everyone can do it just feels like cheating / cheese.
If you want to know how to use Astarian in BG3 don't play BG2 and don't read the 5th ed rulebooks -- buy DOS2 and learn how to optimize Sebille's build. Astarian is built the same way.