If the devices don’t have any broken parts, you could keep at least one of them around as a backup for when your main PC has issues. 2008 laptops are still perfectly fine for e.g. Linux + Libreoffice, and you could load them with a bunch of offline stuff like dictionaries, a text-only wikipedia backup, CD/DVD-based enzyclopedia etc. - this could be quite valuable if your home net becomes infested by malware. I also kept using my old laptop for a long time specifically for its optical drive, because every once in a while I buy second-hand music CDs.

Though in my case, the issue is that my old devices all had hardware issues. My ~2008 laptop has a completely broken keyboard, and a netbook from the same era doesn’t even turn on anymore. Most of my old phones have broken screens etc., and the really old ones are unusably slow (maybe I could remedy that by installing a really old android version). TBF, my current laptop is from 2015 and it doesn’t look like it’s going to stop working anytime soon.