Severance

I’m cautiously optimistic there’s something else Helly R and Mark S can do (or think they can do) and we just don’t know where they’re running to yet.

If you were at that exit stairwell (can he even use it?)

If there is, the writers of the show are being completely disingenuous to the audience. How many episodes in Season 1 and Season 2 were spent showing us all the ways they couldn't escape the severed floor. Yes he could have used the stairway. They explored this in Season 1 where they are standing at the door and the innie walks out, then the innie "wakes up" inside the door again because the outie walked them back in.

Helly R tried to actually commit suicide in the elevator as a way to exit. If the writers suddenly come up with "oh yeah the secret door we've never tried that lets us have a happy ending together" then they've treated us all like idiots.

OTC was a convenient plot development for making the situation more flexible and it wouldn’t surprise me if we see another.

OTC was used more the Season 1 finale. Remember Dylan Innie "waking up" in his clothes closet at home? It was also used on the ORTBO.