Admittedly, it's all tedious but it still doesn't get away from the fact that people should take responsibility for their actions. When you book online, the bag allowance details are made available by each airline, Ryanair is no different. I simply can't understand why it's an airlines fault if people either refuse to read the booking bag allowance when booking, or as I suspect is now becoming the norm, people are taking chances and hoping they'll squeeze some oversized, or several carry on bags into the cabin, undetected.
But of course, the spin and negativity will go into full speed, bashing the airline when pax should face up to their accountability and responsibility. If it's oversized or excessive number of bags, then tag it and into the hold it goes.