Getting a Chromebook to run Linux is pretty easy these days with MrChromebox’s utility https://docs.mrchromebox.tech/
As to the main purpose of your post, I use fedora on my Pinebook pro and it works great. Though with the lack of resources compared to x86 laptops, many things can be slow to start, like browsers. Id never use it to try and watch videos online, it’s a painful experience.
I also have an older Chromebook with a Celeron powering it, and it sips power. I can forget to charge it for a week, grab it, and still have a few hours of battery I can use.
They do well as light work machines. Mines done some weird stuff, and Ive subjected it to various things, but it keeps on trucking. Worst it’s ever done is reset on me, but logging in brought back everything important.
That script has an option to install coreboot in it’s TUI. But it only works on x86, arm Chromebooks aren’t supported by the utility