Except the 5 device limit. With OVPN it means 5 connected devices, with WG it means 5 registered public keys.
Say you use the official Mullvad app and also setup some 3rd party WG client on your phone. That’s now taking up 2 devices. Or perhaps you do have 6 devices, but you never have more than 2 of them running at once. With WG, that’s still 6 devices regardless of them being connected or not, while with OVPN it will indeed be just 2 devices.
Still good to know you have the option of removing your nose, just in case it starts bothering you.