I would contend that it's still useful since you'd be able to turn the corner without over-complicating it by getting it into some weird tilt position.

That might give you a feasible solution, but I doubt it's optimal.

That's especially easy to imagine with tables, but sofas also count.

There are also sofas that can be easily taken apart. Eg one of our sofas at home, an L-shaped sofa, comes apart into two pieces.