The score can be edited just fine, though not in the way you're used to or prefer. It doesn't make your request or others' invalid, but it's simply wrong and preposterous to suggest that MuseScore doesn't allow scores to be edited.
An executable file in /usr/bin can be edited just fine, just not in the way you'd prefer. So much so that certain licenses can legally prevent you from redistributing that binary without source. How easy something is to edit matters --- so much so that legality can hinge on it.
