Back when I used Windows I prided myself in my install age. Can't remember if I started on XP but at least made it from 7, 8, 8.1, to 10 over many years, repairing issues as they came up.
DISM largely does the same thing as reinstall without nuking all your files/settings assuming you can get it pointed at a valid source if winsxs doesn't have the thing it needs.
There's a real cost/benefit question involved in root cause analysis, of course. But that childhood experience turned out to be representative of what I'd continue to witness in the rest of my professional life. When you always choose expedient ignorance, you end up living and working without ever having a clear idea of what your computer is doing, and each investigation feels like another Herculean task you're obliged to skip.