I'm not sure it's not always intentional.
Let's nuance this...
When they do nothing for 3 sec then move... That's not intentional.
When they move then the camera is stuck n them for 3 second... That's not intentional.
But What about ennemies not moving because they just say something ?
It looks like different things to me in the game.
I have the feeling that sometimes, they don't want to do something else than saying something, loosing 1 turn.
Not sure about it but it happens a lot. Sometimes when they're stuck... But sometimes without any (known) reasons.