That’s why. If you use styles and embrace sanity in general, it’s fine. But word is like Perl, there’s more than one way to do it.

Paste additions to the middle of a numbered list from legacy documents that break the number sequence and use custom fonts altar create weird problems? Sure.

Allow sociopaths to format text using a series of invisible text boxes? Sure.

Decide to randomly lose the names of editors and contributors? Sure.