I agree, I see people on flights attempt to take carry on baggage over the weight limit and size, don’t they ever read the what baggage allowances are or just pushing their luck.
Try doing it on an EasyJet ot Ryanair flight, Servisair / Emirates at Newcastle weigh your carry on baggage and on many occasions I have witnessed people being told it’s too heavy/large and they then are frantically trying to put it in their hold baggage.
I always get concerned when passengers are putting heavy bags in the overhead lockers, if they accidentally slip from their grasp they could do a passenger a serious injury.
When B.A. used to fly from Heathrow their carry on baggage limit was 25kg but the size of the bag limited, try lifting 25 kg into an overhead locker.