Many custom or niche domain-specific or hardware specific applications get caught up in this. I can think of 3 expensive pieces of equipment I use that rely on

Many custom or niche domain-specific or hardware specific applications get caught up in this. I can think of 3 expensive pieces of equipment I use that rely on Mac software which always lags OS upgrades by months. People don't choose to use applications like that— they usually don't have a choice. Their OSs not being up-to-date is a problem.