Very minor, but stairs in corners always bothered me. Just leaving an empty square behind the stair often looks a little awkward so typically the solution is to make a second framework wall to support the wall. There is really no practical issue here, but thematically it makes no sense to have double layer of framework walls. Why would you not just leave the frame naked on the inside as just a normal supporting structure of the stair?
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The reason that I started out with the framework corner wall piece is to make the square the stair non-walkable. Btw you can probably find some doodad/item to hide in the nook like we all do with stairs with open frameworks.