I am fine with enforcing rules,....
but if my rimowa trolley can fit in the overhead bin on flights when i flew with international carriers (lufthansa, swiss, turkish..etc), why should they force me to check it? It's not like the Swiss' A321 has larger overhead bin than AA's A321.
Is it a coincidence that they decided to shrink the allowable size / dimension at the time they decided to enforce the rule?
They should target those who apparently bring a way too large carry-on luggage... not those who travel with regular size carry-on trolleys that may be just an inch or two over the allowable dimension.