ORIGINAL: Froonp
If the paper game had allowed for things to be infinite, DIV break down would have been. Harry Rowland the designer of WiF FE is in favor of that. Same for map's scale.
That is not a really good answer to the "why" question though.
Moreover, with the provisio stated for MWiF, that is that corps broke down cannot be rebuilt, abuse is impossible. If you break down too many corps to have many divisions, you will lack corps.
Nor is this.
This renders moot your argument that using unlimited breakdown the Japanese will conquer all the pacific during the suprise impulse. If they do so, they will have no more army to hold agains the Chinese, the Russians, and to firmly hold the strategical islands and objectives.
Or this...
Moreover, your argument that with unlimited breakdown 2 corps will always be accompanied by a DIV (to take the losse) is moot because it is already the case in WiF FE, using DIVs and ARTs.
In Wif, you are often forced to make hard choises between losing an 8-4 corps, or a 3-4 ART or 2-5 PZ or a 2-4 ENG or whatever. With a gazillion of 1-4 inf divisions, those choises are removed. And the choise between losing an ART or ENG or a corps is often not a very easy one to make. The choise between losing a corps or an infantry division is a no-brainer.
Anyway, nothing will prevent you from turning the option off when you'll play.
Quite true, but that is not really a great answer to the why-question either now is it? [;)]
Seriously, that why question needs a good answer before we move in and poke around in the inner play-balance mechanics. Adding unlimited divisions will change combat results-balance.
I dont see why the "corps breakdown cannot be rebuilt"-idea would change any of this. I'll just break down my crappiest corps into divisions, and use these divisions as cannon fodder. I believe the idea was to not allow rebuilding of the corps until both divisions are dead, and I would not have any problem waiting for them both to die. If the idea is to never allow rebuilding of corps that has been broken down, one has to ask if that thought has been thought through...since it will lead to the force pool of a nation constantly getting smaller. Is that desirable? Maybe...but I fail to see the logic behind such a rule.
Nor do I see any logic behind a rule that would allow unlimited breakdown of corps, but not unlimited building of stand-alone divisions. The only motivation seems to be as a stop-gap to prevent a player from breaking down too many corps into divisions...which returns us to "why do we want unlimited breakdown in the first place"-question.
I dont know if the optional rule manpower is included in MWIF btw... Do you know if its in?
As for the Japanese player going wild in turn 1. It seems pretty simple to break up 5-6 corps into 10-12 divisions, load these divisions on destroyers and invade everywhere. Then, the next turn bring them back to Japan and recombine them. Or is the idea that no corps that has been split up is allowed to recombine ever?