That having been said, most of the time when large ubiquitous equipment requires periodic maintenance at scheduled intervals, you have more safety involved. large multistory escalators and elevators have numerous moving parts and circuits to lock out/tag out to ensure equipment service is performed safely. The result of a rush-job is always a gruesome headline on the local news.
Theres also extensive testing. Overload/overtorque systems have to be tested, fail-safe certification has to take place, and the device has to run for a given time before its entered back into service. In my job, I wouldnt think to return a heavy truck to a customer before driving it on both city and highway streets to confirm everything I've worked on performs as expected.