I'm saying that the bag sizers don't seem to be policed/used the way they used to.
On the vast majority of my flights, I see lots of bags that no way in Hell would they fit into the baggage sizers, not in a million years. And those bags only just fit into the overhead lockers. I've even seen some larger bags having to be put inside larger storages on some flights!
As said in the post above, in the age of the 25 minute turn around, it seems staff are reluctant to hold that process up to police the bag sizes (obviously some do, but not all).
I would say that another issue for checking cabin bag size is the on line check in and self bag drop process. This means that apart from security which is nothing to do with the airline, the gate staff are the first airline representatives passengers see, and thus a fair few people get away with it.