[NotPractical]

You can root a Chromebook if you choose to accept the risks involved. This is officially supported.

[skybrian]

Sure, it's a nice feature, but I probably wouldn't. Maybe I'd put a sticker on it saying "my other computer is a Raspberry Pi Pico."

It's not necessary to root every device you own. You can use one to do your banking and web browsing and have entirely separate devices for hacking.

[NotPractical]

Unless you want to look like a criminal, I probably wouldn't carry around two phones everywhere you go.