Please allow the use of user certificates for OpenVPN clients authentification.
And allow to not use username and password. User login is optional with OpenVPN when user certificates are used.
Some providers are now migrating to Wireguard but in the meantime some are still using OpenVPN with mandatory user certificates.
This mean that another appliance is necessary to connect to them. Not good when we are used to Mikrotik and its fast / complete Winbox configuration tool.
Using other routers or appliances for this reason is most of the time a nightmare because of their terrible Gui compared to Winbox.