Think about an invention that isn't useful, and share it to the world!
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Social media. It can be a good thing sometimes but it's make people feel Insecure about themselves.
Shoe Umbrellas. Why can't you just use a normal umbrella? It isn't that hard! If you're worried about your shoes getting wet or muddy, don't wear them.
Plastic
I'm very torn by this. Plastic can have its uses. Many foods would have a much shorter lifespan without it, dried items and meats. (I work in the industry). I think the big fault is the lack of recycling facilities. It should be fully recycled and not sent to land fill or into the sea.
Knife, guns any kind of weapon
Photoshop and other software of this type. No one is perfect, if we all owned up to imperfections, less people would have issues.
Being a Dr Who fan I'd love a TARDIS (time machine) to be able to go anywhere in space and time. I don't know if it would be a great idea because if in the wrong hands it could cause chaos. I would just want to witness different place and see them. I wouldn't want to go and change history who knows what would happen.
Sorry read the post as what should have been invented but never was. My bad. What should have never been invented Heroin. It was supposed to be safer and less addictive than morphine. That stuff kicked my @$$! Clean for 6 yrs now!