Keeping old kit? - YES if it still does it's job.
OK, I am guilty of almost every behaviour identified in previous posts, and possibly some quirky ones of my own. But I will make a case for keeping SOME old kit. For example, I have an old Minolta 35 mm film scanner, for which Windows support was dropped around Vista time. However, it is recognised by Mint 18 and still works perfectly well. It is probably far better built than most modern equivalents costing £00s to £000s. Why throw out anything that still works? Linux OS seems to have a remarkable ability to breathe new life into (some) old kit.
OK, so I am Scottish and traditionally tight fisted, but it is my money.