I often work in hot, oily, dusty environments. So if I don't wash in hot, the smell and stains aren't coming out. And I can't be arsed to separate it.

I've only had color bleed on its first wash, after that the tags are more like guidelines.

Kills bacteria. This is especially important for dishwashing gloves or sponges. It also simply cleans more efficiently and dissolves many stains effortlessly.

I used to do that but after a while the washing machine got a buildup of foul gunk that leaves little specks of crap sticking to everything you wash. Apparently an occasional hot wash is needed to keep the machine clean.

For clothes yes, dishes need hot to break down the oils and grease.