Macbooks are great devices, but Linux is a great "fire-and-forget" OS for situations tech-illiterate loved ones. I've done it many times, with much succes and satisfaction (on both ends) without barely any aftercare. All you really need to do is teach them to install those updates and install a major upgrade every few years (or not, Ubuntu will run fine for a decade).

I can confirm. That is basically what I did for my father-in-law. The laptop is quite ancient by now (more than 10 years old) but still good enough for running current version of Ubuntu.

Linux is the opposite of fire-and-forget. Eventually a papercut always turns up that will require the terminal.

macOS also has (well, had) extreme UI stability. You could transport someone from 2003 used to Mac OS X 10.0 two decades into the future and they would be able to use macOS Ventura (and all previous versions) purely by muscle memory. Good luck doing that with Windows and Linux with their constant UI churn.

Interestingly enough, by iOS-ifying macOS, they've made it much easier to shift someone using an iPhone from Windows to macOS, because they already recognize many of the UI and UX paradigms.