Chromebooks are "Linux" depending on which definition of Linux you want to use, and getting a Linux environment with some root access is possible without disabling Google's code signing - a VM is run, where you have root, with all the overhead that implies. (I hear it's fine when running on powerful hardware, but it's a bad time on cheap Chromebooks.) It's not really root, eg, you can't change the wifi MAC address of the host. (Yes, it's 2019, and I still find myself doing that. Yes it's stupid.) You can disable the code signing and get true root, without having to fully go in and install a desktop Linux, with all that implies (positive and negative). There's a boot screen that can be disabled but that requires opening up the hardware.

It's certainly nice, and a viable option these days, but I wanted to give caveats, as it's imperfect. I used to be a Thinkpad person (I miss my trackpoint dearly) but I'm on a Chromebook these days.