I suspect Larian would say the same re: the latter bit given that the 3 years of early access feedback, polish and testing probably made a gigantic difference to how well-received the game was, as well as providing significant financial support whilst the game was being developed (about $150m before Steam's cut and other cuts).BG3 won;
Best Visual Design
Studio of the Year (Larian)
Best Game Community
Best Supporting Performer (Astarion/Neil Newbon)
PC Game of The Year
Ultimate Game of the Year
Given we are all part of the BG3 community, it's kind of like we all won that one.
There was also a lot of evangelism about the game in the month or so before release, which wouldn't have happened without the fans, definitely helped shape the narrative about he game, including opening minds re: it.
Amazingly, it's still selling really well, right now, on PC. I don't think it's ever left the global top 10, and if Steam is displaying correctly, it's #2 best-selling product on Steam right now (no doubt the awards helping), more than three months after release, and is the game on Steam with the 6th most players online right now (and indeed has been for weeks), with only Counter-Strike, DotA2, PUBG, CoD and Apex Legends ahead of it. Even GTA V is below it!
God knows how many copies have been sold. SteamSpy estimates over 21m on Steam alone, which would mean it'd already made $1.26bn before cuts, but also before PS5 sales, and with the Xbox version yet to be released. Given RPGs tend to have a long tail, that's pretty insane.
I really get the feeling that Larian thought this thing was going to sell like 4-6m copies and then maybe slowly work its way up to 10m over its lifetime, given their rather conservative messaging about it before release, especially the initial "Oh we're probably not doing DLC or another BG game" stuff. Presumably given maximal financial and critical success some reconsideration is being given to their longer-term plans.