The M&Ms were for cases where the show was likely to be considerably more demanding than what the venue normally handled, and they needed to make sure that the people running the place actually stepped up for it.

The organizations doing aircraft maintenance are always handling life-critical stuff. You don’t need a weird test to see if they’re paying attention.

It’s not like this stuff is just decided ad hoc and planes fly with broken IFE equipment because of bad culture. This stuff is worked out by engineers and regulators. There’s a list of stuff that needs to be working for the plane to be allowed to take off. If something on that list isn’t working, you don’t fly, even though the plane may be perfectly capable of it. And I guarantee the IFE equipment isn’t on that list.

Frequently broken passenger amenities indicate bad customer service but it doesn’t reflect on safety.