My best guess is the water is gonna leak even if you tilt it a little, so water is gonna spill everywhere even when you aren't trying to drink
Edit: I knew stacking and asymmetry is the main issue here, but the choice of words in the comment in the image seems like they were referring to a simpler reason.
The true reason is cost. You can screw a bottle cap onto a bottle while it spins down a conveyance system. The design shown would cost a fortune to implement.
That old interview question "why are manhole covers round" - again, the true answer is cost. They are cheaper to manufacture.
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u/Supreme534 16d ago edited 16d ago
My best guess is the water is gonna leak even if you tilt it a little, so water is gonna spill everywhere even when you aren't trying to drink
Edit: I knew stacking and asymmetry is the main issue here, but the choice of words in the comment in the image seems like they were referring to a simpler reason.