For example, I’m incredibly confused about how you’re supposedly to measure liquid laundry detergent with the cap. At least the kind that I have sits on it’s side, so if you measure it with the cap it just leaks everywhere and makes a mess.
Or at my parents house they have a bag of captain crunch berries that has a new design, where instead of zipping along the top of the bag like normal, it has a zipper in the front slightly beneath the top. That way when you poor it you can’t see what you’re doing cuz the bag is in the way. Like what the heck who’s idea was that?
The issue you’re highlighting is due to the difference between metal and plastic. I have an Orca bottle that has a plastic lid that screws on without any rubber gasket and I end up with shreds of plastic in the bottle.
Plastic rubbing on metal leads to the plastic degrading and metal on metal does not make a good seal, so I think a rubber gasket is your only option.
Perhaps a design where both mating surfaces are plastic with metal for the rest of the body? A lot of vacuum insulated bottles have plastic bonded to metal in the cap, they just have to repeat that with the bottle itself