I think it goes without saying the Vivaldi / Proton integration isn’t really geared towards people here who are already more-than-aware of both services and already know how to use both of them.
This is very geared towards people who are all-in on Vivaldi and may not be as familiar with privacy tools and may not even use a VPN. In that situation, I’m 100% okay with this. It means Vivaldi users are being pushed towards one of the best VPNs on the market. And ideally exposes them to the Proton ecosystem.
I doubt anyone here will prefer this integration over their own browser + Proton VPN for desktop. We’re not really the target demographic.