Imo spiritual growth is about surrender, letting go. In developing absorption using the method of just relaxing and breathing rather than hard, contracted, forced concentration on some artificial object or particular spot, one must see what one is letting go of. I think they call that mindfulness.
I saw a utube vid, a bhante was sayiing that the buddhas instructions for breath meditation appeared, i beleive it was, 4 times in the canon, pretty much word for word and he didnt think that was an accident.
I beleive too that the degree to which one wants or sees jhana as important is inversley proportional to the degree one is likely to experience it. So i think the best course of action is to relax and breathe and let go
“The truth knocks on the door and you say, "Go away, I'm looking for the truth," and so it goes away. Puzzling.” ― Robert M. Pirsig