Just as you call AppleCare+ a waste, I could conversely say that cases are a waste...
Just saying...
Two completely different levels of waste.
One costs a one time $20 and allows you to maintain the original iPhone you purchased in mint condition throughout its life.
The other costs $100 and an additional $50 per replacement which allows you to replace your phone when it gets scuffed up... yet does nothing to fix the problem as the new naked replacement will down the line get scuffed up again without a case.