There is also a reason why Isometric RPGs never truly faded away, even with many franchises going to other things like First person or dying, new franchises have risen like POE or even returned (kinda) with how Wasteland 2 and 3 came out. Mechanically, the genre is considered very sound and couple that with good writing and players tend to get hooked. Heck, people still play Fallout 1 and 2 A LOT.
And to that, BG1+2, even considered old, never really faded from gaming culture as far as I can tell. And have stayed relevant enough to get Enhanced Editions with active updates years later, and even other DND games like Planescape Torment and Icewind Dale have gotten console ports.
Also I don't have Nostalgia for BG1 or 2, compared to many here I have only played them recently and despite knowing of them I did not grow up with them because I didn't have them. Same for Fallout 1 and 2 (though I did play some of Tactics when I was younger). I and I assume others talk well about these games not because Nostalgia clouds vision (though for some it perhaps does), but because they are very good games that have aged very well and still play well even by modern standards.