Having TOTP tokens stored alongside passwords kind of defeats the purpose of two-factor-authentication. I think this alone justifies development of a separate app, but there must be other reasons as well.
QUIC can be blocked by the censor. Since connections fall-back on HTTP 2 this doesn't have any effect on availability. the obfuscation this VPN promises is essentially non-existent.
I think this is the first time I've heard anyone say this about the Linux desktop experience! Kudos to the GNOME/UBUNTU people I guess.