Rather than rigid spackle, corners and fine cracks that result from
movement can be patched with paintable caulk. Corners crack commonly
from expansion, and that is most common problem area. Using rigid
material just invites it to crack again; flexible material allows a
little movement without cracking.

+1 I've done that, with paint-able silicone, and it is the easiest and
the best. Easily the least detectable repair, once painted.