People are very lazy to do basic math. I always minimize the coins I am carrying by doing math on my head so that the combined value of a certain coin never exceeds the amount of the next available coin/bill, that way I never exceed the carrying capacity of my wallet.
Most people I know just pocket everything and put on a box at home for undetermined time.
It's not even just that. Coins are heavy, large and noisy. Bills are way more convenient and cards even more so. If we could solve privacy issues with cards I would say get rid of all bills. Maybe just keep a few $100s in my wallet in case my cards get declined for some reason.
Most people I know just pocket everything and put on a box at home for undetermined time.