I agree, considering the WHY in some instances is the hardest part of bass fishing in my opinion. But yet still alluring.
Up here? There arent many big lakes where bass are the top predator, or only predator, for that matter. Pike, pickeral, and various trouts, will fill up a finders screen with deep water haunts just as much as a bass will. Only way to determine what you see on a finder is to catch one, if you can,.... some of these species will, and do, not only colonize the deeper waters, but will mix in together as well. To say that what you see on a finders screen is bass, is a very difficult assumption, as these fish will harbor these "deep haunts" while either inactive, or targeting specific forage, which again, is a difficult assumption alone. Due to the fact that there may be a couple dozen different forage's to choose from. Insect's such as hellgramite's, mayflies, skeeter larvae, etc. etc. etc, to suckers, dace, chubs, herring, alwive, shiner, shad, crayfish, eels, and so on. Keying in on the correct forage maybe a dauntless task, and these deeper fish, usually drive most bass anglers nuts trying to figure out "what's down there?",...
From NH's lakes region, Maines big lakes, Quabbin, and many other large waters in New England. Most bass anglers stick to the shorelines due to this difficult deep structure entity. "Some" will venture out with a dropshot rig, or carolina rig, jigs, and swimbaits, All seeking that magic spot on a spot that harbors those chunky deep water bass, be it smallies or largemouth, but most,... give up frustrated.
I am stubborn, and over the years of being so, have found a few tricks, tips, and hints, that dont "always" work. But pan out on a 50/50 basis if im that lucky! Maybe thats why Im such a "jighead and grub guy" as this is my bait of choice to initiate the first hit. Many of these predatory fish will hit it, be it, reluctantly, or with reckless abandonment. And much like Rick Clunn, at that moment, the why doesnt matter,....its more the "what is on the line" right then.
And that right there, is deep water structure bassing up here in a nutshell. There's alot of doubt, considerations, and anticipation, until you finally see what you've hooked. And if it is a bass? then comes the why.,... Only,.. that thought doesn't arise until my next cast, as the lure dissappears into the depths once again. Anxious for another tummy filled smallie that pushes the PB issue. Affirming another deep water haunt that holds them during a "easterly" breeze, at that time of year.
Science, art, and why? up here? To me, only follow's trial and error, and much of it at that. Then I can start picking apart, or put together, the science, art, and why.
I wonder how much success Buck Perry would have enjoyed employing his theories up here, that would have panned out as bass. Trolling spoons, over deep structures up here? many salmon, and laker guys do catch some smallies, and some largemouth. But they also get pike, pickeral, rainbows, and their quarry as well.