I’m always struck by all the requests I get from players/owners of an existing game, asking if I’d be willing to do a “mod” of that game for some other – often very different – period or topic. I’ve had people ask me if I could do “Grande Armée for the Russo-Japanese War” (I’m not making this up.) And Longstreet wasn’t out for fifteen minutes before people were asking for a Franco-Prussian variant. A prominent person in the hobby asked me if I could convert Maurice to an Ancients game… and so on. Unfortunately, each time I try to do a game for a different period, I start by thinking that I can use a bunch of tested existing mechanisms but then find that they just won’t work for one reason or another, with this new topic/period/scale/whatever. So each game ends up different from the others, often quite different. Then I get lots of emails complaining about that, and asking why I couldn’t have made Maurice more like Lasalle, or whatever. So if my experience is anything to go on, there are a lot of people who would prefer a single set of familiar mechanisms for everything.
Might & Reason works very nicely for the WSS with Greg Savino’s lists though 
Obvious contrarian and passive aggressive old prat, who is taken far too seriously by some and not seriously enough by others.