For yourself, it's totally an individual decision based on your personal priorities and risk calculus. I'm a bit skeptical about purchasing refurb computer equipment in general because the support window is ticking down but certainly I have nothing against used and refurb goods for the home in general.

For companies, there's a lot to be said for standardization though, for my last job, I just used my own phones and computer gear anyway so it was what I wanted and I controlled it (other than MDM latterly on the phone).