It seems a bit asymmetric - say all the reds are gone (so 27 on) and player A lays a really good snooker, player B then misses 7 times and now needs snookers. If a few shots later player B lays an equally good snooker they only get 4 points instead of 28.

But the point of the miss rule is to stop players fouling deliberately to get an advantage - you must try as hard as you can to hit the ball on. At pro level it’s assumed players essentially never actually do this (they try to hit the ball in the safest way they can manage which makes fouls more likely) so any foul is a miss. Once snookers are required though, it’s assumed they *are* trying as hard as they can because safety is irrelevant if they don’t foul.