I’ve been using Debian for the better part of 20 years, and sudo has never not worked.

If you do multiple admin commands, sudo doesn’t prompt for your password. There’s some time limit before having to re input it.

Logging in as root is bad security hygiene. You’ll become complacent and leave it logged in at some point. That’s how you get pwnd.

Why would you sudo su? That defeats the purpose of sudo.