If you are talking about the Fennec browser (i.e. Firefox on android), this link is not pointing to that.

I can’t speak for the whole suite, but Excel sucks in the browser. The browser version do not have all the same features as desktop. I only use Office if I’m forced to and use LibreOffice or Latex otherwise

Build your own locally hosted cloud!

This is the hard part to sell people. I feel like for self-hosting to become popular, there would need to be a “plug ‘n’ play” device that essentially has everything you need to set up a small server on your home network. If you could set up a home server as easily as you can set up a Google Home device, that would be amazing.