For protonvpn with wireguard, I need to manually adjust the MTU down due to using a 5g hotspot wifi solution. It would be really nice if the app could automatically negotiate the optimal MTU when setting up, I imagine by just pinging the VPN bastion server with different packet sizes (once authenticated) and adjusting from there.

Otherwise it would be nice if the app would at least allow you to override the MTU for different underlying networks.