I’m not sure about the rest of your questions, but stealth has been brought up multiple times, eg in
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=844163.As I have understood it, the main differences between BG3 and 5e that make stealth seem so cheesy are (a) in 5e, perception isn’t directional, but assumes the NPC is looking around them and has hearing, so stealthing just behind someone in heavy armour wouldn’t usually be feasible, (b) only rogues and higher level rangers can hide as a bonus action, so the fact that all classes can in BG3 devalues the rogue, (c) BG3 enemies are often ridiculously poor at spotting attackers from stealth (or from outside range, or on a different elevation) meaning that we can often get in multiple attacks before our characters have to roll initiative, which can make taking an ambush approach disappointingly easy in an immersion-breaking way, even when our characters don’t have decent stealth scores, whereas a TT DM would most likely call for initiative to be rolled and combat to start once the first shot was fired.
I’ll let folk who are more 5e-savvy say whether that’s a fair characterisation of the differences, and comment on rogue progression more generally.
