Once a show has run for this long, the bugs have long since been worked out.
There is no test, isolate, remedy.
It's test pass/fail. If a bulb is out....change it. It doesn't take all day.z
If you really think this.. you grossly under estimate just how much of a production F! is. Your thinking wouldn't even apply to a stage show.. let alone a integrated live performance like F! that includes stunts, large scale fire effects, pyro effects, lasers, multiple boats, integrated live and pre-recorded performances, etc.
Ponder all the things that need checking to ensure they are still operating as intended.. even after they've been proven to be setup initially (your bug comments)
- stage lifts
- the large puppet/stage figure systems
- lighting controls
- motion controlled light platforms
- audio control systems
- audio playback sources
- fountain systems
- projection systems
- laser systems
- queing
- numerous boats - and their associated bilge, steering, and propulsion systems
- fire effects controls and safety systems (plus staging/fueling)
- pyro effects, controls, and safety systems (plus staging/loading those..)
- actor harness safety systems
- inspections of performance areas for issues/safety problems
And the list goes on.. and this is all regular stuff that must be done all the time to ensure show reliability and safety for the performers. Shows like F! go through hours of prep and inspections by a huge group of Techs. All live performances go through such staging before performers are brought in, but F! takes that to a whole new level because of the # of elements and different technology involved. Even the safety elements alone for pyro and stunts alone require dedicated run-throughs and safety checks before any performance.
This isn't just 'see what bulbs are out'..