If you use HTTPS, the attacker can still see what websites you connect to, they just can't see what you are sending or receiving. So basically they can steal your browsing history, which defeats the purpose of a commercial VPN for many users.
This is blatantly false. They can see IP addresses and ports of you connect to from IP packets, and hostnames from TLS negotiation phase (and DNS requests if you don’t use custom DNS settings). HTTP data is fully encrypted when using HTTPS.
If exposing hostnames and IP addresses is dangerous, chances are that establishing a VPN connection is as dangerous.