For writing a letter or a short paper, Word is fine. But for anything longer or more complex, there are far better options.
I work in a law office, and use WordPerfect.
WordPerfect uses streaming code (like HTML), so it’s a lot easier to fix mistakes in the formatting without ruining the whole document. It’s really too bad there aren’t any WPD editors on mobile.
Outside of work, I’ve used Google Docs, but it’s extremely barebones comparatively.