If you didn't load the dishwasher it can be hard to say if the dishes are clean without being pretty thorough, which can take a few minutes. It would be nice to have instant certainty, I'm going to keep this in mind.

Depending on how full you load your dishwasher, that might require you to take out a dirty dish again to check… which strictly speaking, is a little gross for some unknown reason.

Not on my dishwasher. If the door gets closed, the clean indicator goes off. And my toddler loves to shut the door.