Great wood and a perfected design are critical but you can only harness so much energy from a string. In my head (true or not), small strings negate the value of a great wood. Or, to be more precise, they REQUIRE it. IMO, YMMV, etc.
smaller string = less energy
bigger sting = more energy
Once that concept was locked in my linear brain, increasing string size became a priority. What followed were some experiments that taught me a lot about letting each guitar have its own voice.
I enjoyed the way many of my guitars came to life with the increased string size. I like to feel the wood vibrate. I also like to bang on the guitar from time to time (acoustic style) without the high-pitched string buzz that is typical of .09's. But heavier strings seemed to dull the sound of some of my guitars. Switching to stainless .11's (I usually use nickel strings) was the trick for those. Some guitars, on the other hand, just sounded better with .10's - so I went back.
You would think, as an example, that heavier strings (like .12's) on an Archtop 4 spruce top would be the best way to go. I found, however, that stainless .11's with a wound G added some clarity to that guitar that was otherwise missing.
But, generally, .11's seem to work better for me. ALL of my McCarty's have nickel .11's. My SE One has .11's. My Grissom has .11's. My Swampy has .11's. And... my Siggy has .11's
And then... there is the impact of string size on shorter scale guitars! Short scale (24.5") guitars get too loose for me with .10's. I play a lot of bass so I tend to grip chords out of tune - especially if the guitar has jumbo frets. Putting .11's on a 1980 West Street Limited (AKA Westy) was a requirement for me. Now that guitar is as close to perfect as it gets. On the flip side, I would almost never run .11's on a 25.5" scale guitar (like a 305). I had to qualify that because I AM running .11's on my SC-J. Writing this out makes me wonder if I would benefit from trying that guitar with some .10's (with wound G). Hmmmmm...