On a workstation, I don't see so much problems. Considering that most people uses an user account that just by typing sudo (or of course spawining a process that invokes sudo) you become root without a password (because we are all annoyed inserting it, but even if we require one, it's trivial to intercept.

If it's a system you use interactively you have other problems. For a server yes, unprivileged containers are a very bad idea, not doubt.