Will throw out an analogy that may make no sense or connect with members thoughts and roast me all you want.
"Breaking in a new baseball glove" analogous to "opening up of acoustic guitar." Well, here goes!
Growing up on a working farm in rural Tennessee, I fell in love with sports. I never remember throwing a rock, stick, corncob, walnut, or persimmon at just the side of a barn, tree, cow, or pig. I threw at a particular knot, a head, a back leg, or my sister's.
When I got old enough and started asking about a "store bought" baseball glove one did not come immediately. But on my 10th birthday mamma made me a cake and when she brought it to the dinner (midday meal) table in a closed cake container, she told me to open it. When I opened it, no cake, but a new $7.59 baseball glove. It took me a long time playing pitch (thousands of catches) to get that glove broken in where the ball didn't just pop out before I could squeeze it on the ball.
Fast forward eight years and I got a job as bulldozer operator's "gopher" and decided I wanted a really good baseball glove. I spent $175 dollars on the best Rawlings infielders glove Nashville Sporting Goods had. The good glove did not take nearly as long - you could use it in a game after a week. I am sure the quality of leather and how it was stitched plus eight years of company improvements helped.
I am thinking higher end acoustic guitars do not take as long as less expensive guitars to open up.
Woods, bracings, and glues surely react quicker and "open up" differently. I would say you get more consistency from high end guitars.
