I've not run into any snags with Yubikey yet. Of course I only ever use one browser on only 2 OSes. Plus I rarely have emergencies where I absolutely NEED to easily access all of my stuff away from the home/work environment. Also, Yubikey is typically only one of my 2FA options. If I ever run into an emergency where I need to access my stuff with uncooperative OSes/software, there's still the authenticator app backup.
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