I played Doom, Doom 2 and Final Doom all the way through about 20 years ago - I can’t recall a single instance of this kind of level design. Doors stayed open o

I played Doom, Doom 2 and Final Doom all the way through about 20 years ago - I can’t recall a single instance of this kind of level design. Doors stayed open once opened. Maybe it was done with corners/sight lines instead? To be honest I remember some vast areas rendered, especially when accessing secrets.