For other players, I'm sure Larian's origin system is really effective and preferable. It just isn't for me.
If I recall correctly, the data tends to show that Origin characters are by far the least played. So it's not just you but most people don't have much interest in playing an Origin character compared to creating one (Especially true when Origin characters are also companions you meet early into the game, meaning you basically already get a playthrough with an Origin character regardless of it you start as one or not. With only a few extra scenes/dialogues being the difference)
Meaning that this "Bland, faceless PC character" concept only really has the benefit of allowing for more versatility in character design. Such as allowing Eternal characters in Divinity or Dragonborn in BG3.
That is, without the drawbacks of either having to create multiple background scenarios to establish the races (Like how DA:O does where human and dwarf characters have different prologues, with mages also differing from the standard human background) or trying to create some weird generic story for why such varied races with wildly different cultures end up having the same backstory.
Which requires more work than simply sticking in a blank slate.
