Glassware looks shiny from a dishwasher.
Glassware looks yuck when washed by hand - even with a lot of care. A dishtowel will get glassware mostly shiny but it takes way more work and dishtowels are just icky (past trauma of smelling a rank dishtowel, or watching someone wipe their mank hands or face on a dishtowel, plus you know most people wash them with underwear, fabric can't be hygienic).
> Glassware looks shiny from a dishwasher.
It most certainly does not in any dishwasher I've ever interacted with. Glassware is one of those things that I can very easily get cleaner than a dishwasher.
Maybe glassware is just easier to evaluate whether it's clean or not?
But just like looking clean doesn't mean being sterile, sometimes you can have benign residue such as mineral deposition which are not dirty per se.