>I wonder if engineers who designed my elevator or airplane had "ok it's very surprising that it's working, let's not touch this" moments.
I honestly sometimes do wonder. Judging by the elevators in my building some things even barely work at times. They go down often and require parts replacements that take weeks to arrive. They're barely 3 years old.
"to go down" means "to be in a non-functional state" as in "Facebook went down". Compare to "to go up" like "servers are up" i.e. servers are functioning.
I honestly sometimes do wonder. Judging by the elevators in my building some things even barely work at times. They go down often and require parts replacements that take weeks to arrive. They're barely 3 years old.