S-Mode is an appliance mode for Windows that prevents installation of any app not from the Microsoft Store. Disable S-Mode and you can install any application like you’ve always done, including Firefox.

It’s most useful for something like /home so you have a full backup of your home directories without having to worry if some app has dumped its settings on a folder you don’t have marked for backup. But also backing up / is useful because it gives you an easy recovery in the event of say disk failure. Just restore the entire system from a backup.

Fedora should play nice with Secure Boot enabled. You also shouldn’t need to do anything with the TPM.

Depending on the model and brand, there’s probably a YouTube video showing how to disassemble it. This can help you find the keyboard connector and how to disconnect it.

So the only difference is one is a phone, and the other a gaming device? Because Nintendo js a gatekeeper in exactly the same way Apple is. Nintendo controls the entire operating system and which apps you’re allowed to install on the Switch. You’re going to have expand on how Apple has economic power over other companies and people for me.