It's more about, I don't like having a global directory namespace that everything gets dumped into. I know that PG data is usually in /var/lib/postgresql/data,

It's more about, I don't like having a global directory namespace that everything gets dumped into. I know that PG data is usually in /var/lib/postgresql/data, but I like Docker because if I ever need a 2nd or 3rd database on one system, I can give them more meaningful names and not feel like I'm touching Important System-Wide Stuff.