For me that would be the 70's up to present day.

Those tiny milk cartons that you have to fold one way and then pull another to create a spout. It often does not work all that well. Particularly for kids. So whey do they still make them?

Gum. It tastes good for about two minutes and then it tastes like crap. We can put robots on Mars but can't make a long lasting gum.

Baseball. Why is it still soooooo slow. The announcers always sound like they are half asleep or smoking weed. Can't they find a way to make it more dynamic?

The sound car blinkers make. That tick tok...tick tok...tick tok. It sounds the same in a 1971 Pinto as in a 2020 Lexus.