There's a practical problem about time and energy, and a more subtle problem of what it does to a writer's head, to continually analyze why they write, where it all comes from, where it's going to. ↗
You can't instruct an audience to laugh, but what you can do is read well and understand the spirit and subtleties, if there are any, in the dialogue. ↗
I sometimes got distracted easily and allowed my mind to wander when I needed to be focused. It's quite subtle, really, and just being aware of it helps. ↗