Battery management tends to be best-in-class on Chromebooks, it's far from certain that you'll get anything nearly as good after installing 3rd party Linux on it. That's my #1 reason for not even considering it (despite having installed Linux on many different Chromebooks years ago when they were new and ChromeOS was still literally just a browser).

My <$200 ARM Chromebook got around 12-14 hours battery life new (though as with my M1 Macbook has degraded to probably 70% capacity after 2-3 years). It draws essentially no power in standby (ChromeOS will enter an ultra low-power hibernate-like state seamlessly after a while). I've opened it up a month after last using it and it turns on in <10 seconds having lost a couple percent.

Updates are seamless and add like 5 seconds to boot time when they apply during a restart (thanks to ChromeOS A/B update model there's no loading spinner or anything, you reboot and it's done. Update countdown extortion a la Windows isn't a thing either, you can stay on an non-updated Chromebook for months without a reboot and the most you'll see is the same passive "Click Restart to Update" button in the notification area.

I use the built-in Linux VM all the time, it runs GUI apps like VS Code without any issues, and my ARM Chromebook runs all sorts of regular Arm64 Debian builds for GUI or terminal out of the box. I turned off the Play Store for Android Support, in the past when Linux support was weaker and web APIs in general weren't as capable I needed it for some specific apps but don't really have a need at this point.

The security model on ChromeOS means that untrusted scripts/installers running in the Linux VM are completely isolated from anything on the browser so you (or your proverbial Grandma) don't have to worry about credential stealers/ransomware/malware. You can copy files between the ChromeOS filesystem and the LinuxVM filesystem but a process running in Linux can't cross that boundary and are confined to the sandbox.

Plus, very much unlike my Macbook, I can actually install an app from Github or compile myself without 7 clicks and three different dialogs each time (as is the case with Apple's aggravating security hassleware on MacOS Sequoia). Proving you can have a heavily locked down, secure model without actively making the user experience as miserable as possible (to "encourage" use of the built-in app store).

It's easily the least intrusive OS experience of all the major OSes, and completely gets out of the way without drawing attention to itself. And sure, Google is an advertising company, I get it, but my Macbook advertises iCloud products and Apple TV shows to me more than anything on my Chromebook.

With the 10 year Chromebook support policy, I've got a crazy amount of life out of all of my Chromebooks. It really is liberating having an OS that de-emphasizes its own existence in a world where I have to fight ever changing MacOS deprecation and security restrictions and Windows bloatware being thrown over the fence in every other update.