Is there a technical reason for non-removable Android Gmail accounts?

Quote:

If you have trouble removing the primary Gmail account-the one you used when you first set up your phone-try adding a new Gmail account, setting it as the primary account, and deleting the unwanted one. If that doesn't work, perform a factory reset.

Factory reset to remove an account?!

Quote:

On some Android devices, you can't remove a Gmail account. Instead, disable it at Apps > Gmail > Disable.

Disable Gmail to remove an account?!

https://www.lifewire.com/remove-goog...ndroid-4151120