Watches

I don't like it because I don't need it. I only like it on my travel watch, but I don't think I've really needed to know the date in years. And if I did, I'd be on a computer which has the date right there at a glance.

It also makes it more of a hassle to set the watch if it winds down. Not a huge hassle, but still.

Third, it usually just doesn't look good or isn't well executed. To me, watches are mostly jewelry so looks / design are some of the most important aspects, and very few date windows actually enhance the design aspect of a watch. Some are ok, and most just look lazily tacked on after the design was finished.

So in short: mostly looks bad, makes watches more annoying, and I never use or need it. So that's two negatives vs zero positives, for me personally at least.