Mandate a reasonable support delay, beyond the 5-to-7-years that seems to be the gold standard today. A computer from 10 years ago can still do a lot of things.
2012 macbook pro user checking in. If it weren't possible to work on this computer myself, I wouldn't be able to use it anymore. It's been upgraded to 8gb of RAM then 16gb. It's been given an SSD. Various flex cables and the trackpad have been replaced. Battery has been replaced. All I do is use this thing for stackoverflow, email, and ssh, compute stuff happens on a server anyhow. As long as I can source parts off ebay, I don't see any reason why this thing can't make it to 20 and beyond.
