Yep, or maybe we have smarter or more persistent cats.

Anecdotally, once I had two cats that I "trained" to use a catdoor I had just installed.

Cat #1 learned to use it in like three times I guided him thought the thingy. Cat #2 simply couldn't grasp the idea and after like 100 attempts I gave up.

Later I heard "boom, boom, boom, boom, boom, tlatlac!", cat #2 never learned to use the catdoor "properly", or maybe he had some vision defect, cannot really say, but he got that it was a way in so it simply went head in on the whole door (from left to right in 15 cm steps) until he got through the cat door.

One way or the other, he got in.