I use Namecheap too, but they took forever to add 2FA (it was added a few months to a year ago, maybe?) and I don't have any faith they'll add FIDO2/U2F any time soon.

EDIT: Oh daaamn it looks like they did it! Huh, faith restored. jgc, CloudFlare should follow!

EDIT 2: I'm just full of failures today, CloudFlare supports U2F as well. This is great news all around.