They could be, and probably should be repurposed
But also, brand new chrome books are ~$80
By the time you collect, clean, repair, and reimage the older computers, it may well be cheaper to just buy Chromebooks.
I hate seeing anything useful going to the trash but the economics aren’t great in this case
I just got a 2018 Honda Odyssey and it’s great. It has the touch screen, but also has physical buttons for almost all of the climate and radio stuff. That’s how it should be IMO. Just give us both!