Without snap, the front door is wide open: all applications you run are unconfined within your user account and can snoop on all of your files. On a normal single-user desktop system, almost everything valuable is within your user account, not root. If an attacker does want root (such as to install a rootkit that can hide itself or to access other user accounts), they can install an alias to sudo on your account and piggy-back on the next time you use it.