I agree that hand luggage is getting out of control.
Even with these bag sizers, the size of some of the 'hand bags' are bloody massive, and the things people taking in them is getting more random too.
In my travels, I have been stuck behind people carrying:
-a satellite dish
-brake disks for a car
-a bag full of rocks/pebbles (no, I'm not joking in the slightest)
-a full car wing mirror, indicator lights and all
-a microwave oven
-an angle grinder
And my personal favourite, a bag full of oversize liquids, like shower gels, shampoos, drinks and more, there was literally nothing else in their bag, but they still protested to say 'why can't I take this, these rules are ridiculous!
It's time hand baggage was scaled back down. Either the things you need for a very short city break, or, things you need for your flight and that's it! We didn't self implode, or shrivel up in a corner for the short period we were not allowed to carry hand luggage at all, so, we can do it again.