I don't know what you mean linear. BS was a pretty typical corridor shooter, the only exceptions were some more or less hidden rooms and passageways (which was something that Wolf 3D already had). It wasn't Deus Ex. Infinite actually felt more like Deus Ex as you had a lot of open spaces and often people to (rudimentarily) interact with, instead of just going around killing the respawning mutant maniacs (as in System Shock) and an occasional boss.

I don't know what you mean linear. BS was a pretty typical corridor shooter, the only exceptions were some more or less hidden rooms and passageways (which was something that Wolf 3D already had). It wasn't Deus Ex. Infinite actually felt more like Deus Ex as you had a lot of open spaces and often people to (rudimentarily) interact with, instead of just going around killing the respawning mutant maniacs and an occasional boss.