Underrated use cases (which I hopefully don't ruin by saying out loud):
-Share a browser session; someone can log in and let someone else do stuff without having to share their password.
-Burner phone to install garbage, or untrusted apps on that "you only need once" or that you just need to use to screenshot a coupon etc.
-Burner phone to access Facebook or TikTok with, with no private data risk
-US IP address to get around geoblocking