Disposable cameras. The wastefulness of an object made to be thrown away aside, they took bad pictures, and if you wanted to take more than 10-15 pictures of your trip you'd have to bring a bunch of the things with you. Price wise an inexpensive traditional camera and half a dozen rolls of film were about the same price of five of the things IIRC.
Smart phone UI design still sucks but its so much better than it was in the early-mid 2010s
References to sexual abuse under the spoiler
The people who say shit like "Oh dating sucks now, you can't even flirt anymore" drive me up a fucking wall. Its not that people are prudes now, people don't put up with sexual harassment like they used to, and that's a good thing. The discussion around consent seems to be a lot better than it was when I was younger. There have also been improvements in sex ed and survivor resources in the past decade.