For ProtonVPN as an example: you can go to the downloads section and download the wireguard config you want and then import it from the wireguard gui.
For me, I would never use other inferior VPN clients after knowing how efficient, supported and developed are the official Wireguard gui are.
Other providers who provide configs:
Thats great, but if you want to switch to another endpoint, change DNS servers, etc, the VPN app helps facilitate those changes, rather than you manually changing/updating wireguard configs.
There is a reason the VPNs provide those apps rather than just give you wireguard configs.
You stick the config in /etc/wireguard and then it’s just
wg-quick down endpoint1 ; wg-quick up endpoint2to switch locations. (Being wary that the VPN will be down for a moment.) You can name them whatever you like of course.Setting up DNS properly is not that hard and only needs doing once.
Import multiple confis. That would solve this.
You can change DNS server in the Wireguard app(by editing the config). It just requires some low amount of knowledge to do that.
You might prefer to use unofficial Wireguard/ VPN provider client. But It’s not the most efficient or the secure way to connect.
How likely are vpn (mullvad) configs to change over time? Will I end up having to constantly update them, which is something I assume the native app will do.
Secondly, do the wire guard tools include things like a killswitch on disconnect so I don’t accidentally send traffic if I get disconnected (eg when the VPN node I’m connected to goes down for maintenance)