I had a customer years ago using a Vic-20 as the controller for his greenhouse. The Vic-20 at that time had already been discontinued. He bought in two units

I had a customer years ago using a Vic-20 as the controller for his greenhouse. The Vic-20 at that time had already been discontinued. He bought in two units to fix to have in stock since he already had a unit running his greenhouse. I asked him why use Vic-20s when there were a number of controllers already on the market. He said the problem he never knew when the present unit may fail and the Vic-20 did the job of an $10,000 controller which he did not know how long it would take to get the present controller to work on his system and the present one works fine. It has been decades since I did the work and I would not be surprised if the system is still working today because he was prepared.