But you yourself admitted that you hardly even gave a glance on DoS 1 and 2(because of tb) until BG3 so what made BG3 catch your eye? Since you knew that BG3 would also be turnbased? The name recognition of Baldur's Gate, or of Larian?
Neither actually. I knew absolutely zero about Baldur's Gate other than that it was a decades old RPG from the days of Diablo 1. And I did not recognize the studio until after I took a look at their other projects. It was a simple leap of faith on my part because the game looked really impressive
BG3 looked like an RPG that had all the RPG elements that I love and I never saw a top-down RPG with such a high quality production. Once I saw the scene with Lae'zel on the Nautiloid, at that very moment I was so captivated by everything that I had to see what the game is all about, despite it being turn-based which I extremely disliked at the time. Thanks Lae'zel! So it was pretty much; "This game looks awesome, Imma try it out".
So after playing it for a very short time (only up to the crypt) and to my surprise tremendously enjoying it, I went to check the studio's other games and that's when it dawned on me that this is the same studio that made Divinity Original Sin 2, as I knew about DOS2 and its reputation of being an amazing turn-based RPG. So I got the game to somewhat satisfy my itch for BG3, even though I was afraid I won't enjoy it, but instead it ended up being a completely different itch all of its own and one of my favorite games of all time. Loved it so much I got DOS1 too.
At that point it became clear to me why DOS2 was so loved and that Larian simply makes great games. It's no small feat to convert a turn-based hater to a turn-based lover. So I am not even remotely surprised that BG3 is such a success even now during its Early Access state, as Larian's track record is consistently good.