My situation was my dad's existing Windows laptop was borked, and on a visit for his birthday with other family, I was tasked with fixing the situation. I'd never considered a Chromebook, but the more I thought about it, the more it made sense, given that he's past doing anything beyond Web browsing and writing emails. Local storage was irrelevant, and in 2021, any CPU was sufficient.

We splurged and got him a $300 model with a nice, big 1080p screen that I still had to scale to 150%, and he was very happy not to have all these things on his desktop and just a few big buttons that did what he wanted.

It's not a solution for repurposing an existing machine, unfortunately. But the savings in time and agony (I had to unsnarl a few things with his accounts on all sites after local "help" did about what you'd expect from someone taking advantage of a guy in assisted living) since have more than made up for the initial expense.