Basically, I don't want to develop a playstyle that becomes obsolete once certain rules change.
Personally, I don't love that we can throw potions. I think it would better if only Rogues could use hide as a bonus action. I don't care whether wizards can scribe all the spells or just some of them.
But my preferences aside, I'm okay with whatever the rules happen to be. I just want to know what they're going to be. I don't want to get in bad habits.
Right now, I can have my Sorcerer cast a leveled spell as an action and then quicken another leveled spell as a bonus action. I'm okay with that if it's going to be the rule in BG3. But if it's not going to be the rule, I'd rather avoid doing that so I don't lean on it as a tactic and then realize the option is gone.