As I've said, that would not fit into their device that shows the limit of what can be taken on board. The fact the rule is ignored doesn't make it right to do so.
It is selfish not to check in a case that size, leaving less room for everyone else. If everyone did that then 60% of the passengers would have no stowage space. I've been on too many flights, especially in the US, where people bring everything including the kitchen sink on board, with the flight delayed while the crew desperately try and find space for all the bags.