There seems to be a convergence going on. Most seem not able to cope with the one overhead bag, one under the seat bag... Both easy and Wizz have gone down the route of the first onboard the aircraft will get the space in the locker, wizz with Prioirty Boarding, and easy with Speedy boarding.
Maybe this should be the way its policed at Ryanair - with only the priority boarders allowed to take two pieces.