On my last Ryanair flight there wasn't room for all the hand luggage in the lockers.
It also struck me that I don't think there were more than two people on the plane that had hand luggage more than 2cm under the limit.
And with the hold guarded by fascists that want commission for charging ever higher fees for being in excess of ever falling limits, I don't think this is much of a surprise.
Planes need to be designed according to the modern commercial era, which I can't see changing.