The last-ever penny will be minted today in Philadelphia

We eliminated pennies in Canada in 2012 and the transition was a non-issue. The vast majority of retailers would round cash transactions to the nearest $0.05, but a few would round down to the nearest $0.05 in favor of the customer. https://en.wikipedia.org/wiki/Withdrawal_of_low-denomination...

Canadian cash is better than American cash in several ways: No penny, durable polymer banknotes (instead of dirty wrinkly cotton paper), colorful banknotes (instead of all green) that are easy to distinguish, $1 and $2 coins in wide circulation (instead of worn-out $1 bills).

American banknotes have numbers on them to easily distinguish the different values!

Not everyone can see.

Australian notes vary in size for this reason.

One thing about accessibility and usability, is that when you design something for the minority it tends to make things better for the majority. Take ramps for example, they not only server those in wheel chairs, but also families with strollers and elderly with walkers.