There are shortcut keys on the keyboard, usually in the F key row.

Not bad for three years.

You can replace it if you want the original capacity back.

Unless you get a desktop replacement laptop with a entry level CPU, then it’s still going to be thermally limited.

If it says i9-12900KS, then that’s what it is. There isn’t a difference, they’re the same thing.

They want you to run Windows, which is why they don’t have any support for other platforms.