Maybe they can check Baldur's Gate 1 and 2 ?
So override whatever character player has created with pre-determined identity? (you are a Wizard, Harry! I mean a Bhaalspawn)
BGs are not great examples of backgrounds and reactivity... partially due our past and future being predetermined. Whatever, roleplaying is happening it is mostly in your head. The biggest streak of brillaince in BGs is that whatever character you want to play and roleplay as still works because of how fatalistic the Bhaal spawn heritage is. There are definitely examples of reactivity, but I don't think that's BGs strongpoint.
I don't think lack of hand-crafted reactivity to our backgrounds is a problem in itself (Arcanum is one of those great RPGs where as far as I remember the background had numerical importance), but I didn't like origin system in D:OS2 and I am scepting about in BG3.
BGs was great because it figured out how to make a party based RPG focused around a single protagonist - a perfect PC RPG, with optional coop friends but no need for them. Simulate social table-top experience, rather then recreate it. As genre evolved it become more sophisticated allowing for tighter worldbuilding and thematic exploration with companions reflecting the world and responding to our roleplaying choices, rather then just accompaning us along the journey.
Source in D:OS2 and tadpoles in BG3 give me a sense of a
chain tying coop buddies together rather then something to build our character around. Not something to confront, not something to think about. Those are plot devices not a plot itslef. RPGs generally gives us a certain pre-determined character arc, and the trick is to make this arc as flexible as possible to accomodate as wide of a range of characters as possible. Larian, however, opted in D:OS2 for couple really constrained (and in the end rather unexplored) characters and blank slate option which lacks direction and definition. I wasn't a fan of neither of those options (mostly played with origin characters, as I knew beforehand that customs are simply weaker)
[I apolgise if any of Larian writers stumble on that. I try to express myself as well, as I can, but I am afraid I am out of my depth when discussing narratives and writing]
