The ISP would still see the IP address of the VPN you're connecting to, but it would not be in plaintext compared to normal DNS from what I understand. Should one even bother or just let it be as it is?
Edit: I mean, instead of the ISP getting the domain name of the VPN server in plaintext, they'd only get the IP of the server if you use smart DNS like quad9 from what I understand. Is this correct?