User blog comment:Rappy 4187/Technical Update: December 7, 2015/@comment-24473195-20151209160356/@comment-24473195-20151209230656

"I don't see this any different than wikis displaying notices such as reminding a user to add their signature if they forgot after they hit publish. I hardly see how just adding something as simple and as similar to a category is such a hassle."

1)  A Category is optional, and doesn't hide a considerable portion of the screen.

2) Just because some wikis choose to use that method doesn't change the fact that it is a horrible user experience.

The expectation is that it should either be saved or at least there should be an error. That's what publish means.