ChromeOS Flex might fit the bill though, and the installation process is probably the most straightforward and handhold-y out of the Linuxes. https://chromeenterprise.google/intl/en_uk/os/chromeosflex/
For a lot of home users, a "the browser is the new OS." If they're doing everything with cloud apps, then they really don't need to interact with a conventional desktop very much. Assuming they don't run Windows software such as games.
Battery life is no different than it was with Windows.
Linux mode was easy to set up, and hard for me to damage. ;-) And it doesn't seem to do anything to the Chrome OS machine, so you can wipe it and start over without re-installing the entire machine. Jupyter Notebook runs just fine, so I'm pretty much all set. Jupyter is practically my OS these days.