The computer pops up a warning if you plug a fast device into the slow port, which is a lot more informative for the average user than a tiny label that most users wouldn’t even read.
Labels would be nice, I guess, but their absence is hardly a dealbreaker.
Windows has been showing popup USB speed warnings since at least Windows XP.... so 25 years?
Let's not use this cope to mislead anyone into thinking this is a unique Mac innovation (it isn't) that trumps this abomination of human factors (it doesn't).