Re: Wot no Wi-Fi?
Google recently extended the lifetime of all new models to eight years from the date of platform release. I think they did so at the beginning of 2020 or thereabouts.
Even as one of those obnoxious people who tends to keep his technology around until it's given every bit of good that it possibly can, I think that's pretty fair with the qualifier that you want to be sure of selecting a truly new model. Later Chrome OS updates added a field in the "About Chrome OS" part of the settings application indicating exactly when a model's support lifecycle ends. It would certainly be more helpful still if this information was featured on the carton or at the point of sale and maybe that will happen at some point.
Realistically, all of this means you'll probably get about seven years. With many Chromebooks landing in the hands of children, I think a lot of them will be fairly used up by that point.
By way of Lacros, Google's also been tinkering with the idea of further separating Chrome the browser from Chrome the OS as a potential extension of a given platform's life. (I'm only an interested party with a lot of time for cheap computers with low power consumption, and have no affiliation whatsoever with Google or anyone else who provides Chromebooks.)
You can keep things going for a while longer, provided you're feeling somewhat adventurous. Many Intel (and possibly some AMD) Chromebooks can be modified to run an operating system of your own choosing, especially if that happens to be some variant of Linux. I'm hopeful that in time the same might be true for the ARM based Chromebooks.