There are more benefits to using multiple user profiles then just the ability to delete them, although that is indeed one of them as deleting user profile wipes the corresponding weaver slot making it a good way of deleting data.
One of the other benefits is, that apps can use IPC to communicate and share data between each other (With mutual consent), but not between user profiles. This can be useful for example if you only want certain apps to use Google Play services.
Other good feature is the ability to End Session. This makes the profile inactive so the apps can't run anymore and purges the encryption keys from memory and puts the profile back at rest.
There are settings that are only available on the owner profile. Such as hotspot that you need to enable in the owner profile and then go to your secondary one and it will stay on. You also need to enable "Turn on phone calls & SMS" if you want to recieve calls and SMS in the other profile.