I've only taken apart some of my Competitive decks and 1 or 2 casual ones - Zur (Shimmer Myr version), Ezuri, Claw of Progress, Inalla and Grothama. Those at least are the ones I can remember. I've certainly proxied up several decks to try over the years but found out they weren't for me.
Outside of Sidisi which I'm actively tuning right now, most my decks haven't changed too much since they were first built. The only exception to this is Mizzix which did go to a full storm build and I've since changed to use Thousand-Year Storm.
I too once sought to have a collection of EDH decks in all 32 color combinations but soon ran out of inspiring ideas as to what to build. I find that more than color combinations, it is unique card choices, strategies and deck mechanics that are engaging. Once I built an EDH deck around a certain theme or mechanic I simply can't be bothered to repeat those in another deck. My goal is that in each of my decks, the ~10 most exciting cards for that deck are also unique to that deck, or at least fulfill a different function.