At work I guess you only do work related stuff, so at the end of the day it’s only work-related data that the browser has access to. Why would it matter to you?

99.9% of my the personal browsing I do is in firefox both on phone and desktop, but on work laptop I use Edge because 1. the work web-apps seem to favour chromium based browsers and 2. it’s not my data so I don’t really care about the privacy of my company’s data, they have a data privacy officer to worry about that.

You’d be surprised how many legitimate email are sent with failed SPF. Even Microsoft sometimes doesn’t update their MX records and the SPF fails.