No one who enters retail is taught how to properly count out change. I was taught to start at the total and count the change out coins to bills ending with the amount the customer gave ("$1.85. 1.90, 2 dollars, 3, 4, 5 and 10."). I was also taught to not put the bill in the till until the customer was satisfied and walked away. You had proof when they say, "Hey, I gave you a twenty and you gave me change for a ten." "No, ma'am, the ten is still right here." It is aggravating at a drive up window to have someone place bills on your palm and then they try to pile a bunch of loose change on top of the bills.
Also, even banks don't face bills (turn them so they are all front side up all facing the same way) anymore. I was taught that it is easy to see a non-matching bill when you are counting them out if they are all faced. It is also easy to see if someone tries to count out bills and has slipped one folded in half in the stack so it gets counted twice.
Yeah, after COVID I started using a card for pretty much everything and I'm probably not going back.