[rendaw]

I tried Porkbun after suggestions here. The symbols in my password caused a 403 error. Porkbun is terrible (although I'm not sure if there's a better other option).

Cloudflare also isn't a general purpose registrar - they won't let you point to external nameservers which makes migration bad.

EasyDNS doesn't support U2F.

Google... the usual risk of getting banned for some youtube upload and losing all your domains.

I switched to DNSimple after several Gandi fiascos. I'm not a reseller, and the fast that they charge a fee made me hope they wouldn't try to skim in other places, but I'd be happy to know of a registrar that checks all the boxes (box 1: u2f, box 2: no glaring technical issues).