I never found pathfinding a meaningful issue in the old games because I'm never controlling my party in ways that requires an extensive reliance on pathfinding to begin with.
The AI is systematically turned off. Everyone is just supposed to move where I say and /or auto-attack with the default weapon unless I order otherwise and that's pretty much it. I want my characters to move toward the selected spot in the proximity or to walk across the area together as a party. I'm never sending them half a map away without even checking what's on the path.
It's a different matter in BG3 precisely because characters are neither comfortable to move individually "selecting the exact spot" (once again, because it requires to chain/unchain them or swap to turn-based mode) nor reliable to manage as a party, with their tendency to move on their own and dance around the selected character.