You'll always find examples like that. I knew someone who had been using a BBC micro for running a custom lighting rig for 30 years. Like the amiga running an air conditioner, it didn't really make much sense. You could use something more modern, more reliable, more supportable.
So what if its more "modern". Do you need a more modern hammer?
The A2000 running the heating and cooling for 30 years. Needed a scsi drive changed twice and they wore out a couple of mice. The software was written in C by a student of the school with very little down time. Can't complain the reliability
To replace it the quote is $1.5 million to $2 million. When asked why it hasn't been replace a spokesman said "because it just works". I hear that said about Linux, but this time it really is true.