I brought a laptop from 2003 back from the stone ages. It runs surprisingly well, is up to date, and only really struggles with web stuff because of the state of things. Antix linux running on 2GB ram, Pentium m 1.4GHz, and an SSD in an IDE enclosure. Uses about 200mb of ram. As far as being functional, the screen is small and low res, and it doesn’t do these newfangled video formats. But if you consider 90% of my work life is in spreadsheets and documents and low resource applications, it really could be just fine. I’m not saying I would enjoy it if it was all I had to use, but I could if I needed to.