I'm kinda disappointed CP is looking like it turned out good. There was so much hype, I was hoping it'd be crap. Nothing like schadenfreude, after all.
I never had that much problems with ME3s ending.
My big problem with the game was that most of the individual quest storylines were very much the same as they were in ME2. You went to mostly the same places, and people still had the same problems. So it was just boring.
You had to use the threat/taunt mechanics for that, not positioning as much.
I played DA2 on the highest difficulty without using a mage or healing potions. The DLC were a bit tougher, had to use healing potions in those.
Frankly, I don't think you can read anything to it. People change jobs a lot in the game industry. If there was some other info then maybe, but just "this guy left, this guy was hired", not really.
Dragon Quest is just widely popular and known in Japan, so that might be it. https://en.wikipedia.org/wiki/Dragon_Quest#Cultural_impact
There's even a live-action comedy drama that's basically a Dragon Quest spoof. Can absolutely recommend it, even if you've never played any Dragon Quest games. https://en.wikipedia.org/wiki/YĆ«sha_Yoshihiko
I like talent tree -like systems, much more interesting than usual lists. Though, at some point you'll want a 3rd party site where you can plan and check beforehand what to take... Thankfully PoE has that, Grim Dawn too.
I've played a bunch of Grim Dawn, and find it kinda ok. I would prefer playing either Diablo 3 (if it had any new content), or Path of Exile (if it wasn't such a huge timesink).
Lots of small gripes with it, rather than any huge ones.
D&D has always been very "top" heavy though, even in 3e and it's versions, you pretty much have to plan for feats or prestige classes from level 1 if you want to take them.
5e has a lot of spells that require concentration (most spells that have a duration), and you can interrupt those by attacking the caster. This is a pretty important part on how casting multiple spells with durations is limited, so this probably exists in BG3.
Did they go for random checks? This game is going to be a major annoyance... 5e has very few modifiers for skills, so you probably can't top out a skill to always get a good %.
(Rogues can get some big bonuses to thievery type skills though)