Well it sounds like you want a stronger ai which is independent to having troops restored. As a balance effect if the AI were stronger than troop availability (as well as money to buy them) could be increased.
It is true when I played the first game the first time it was very difficult to balance between troups and cash; but today the game is now very easy even on impossible so I could suffer a more difficult ai at higher difficulties levels.
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However I suspect that improving the ai is a bit of work (truely good ai is very rare and given enough playing time I'm not sure such even exist; that's why most games 'handicap' the player a higher difficulty because it is easier to (reduce cash, increase opponent army strength and similar then it is to actually make the ai smarter)).
Yes it would be wicked if for example the opposing mage use pain mirror after your massive assult (a favorite tactic in my last game was to create a very weak troup (like thorns) have them be slaughtered by some huge stack and then obliverate the stack with a couple of pain mirror
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Anyways this incarnation is taking an extra 6 months or so so perhaps it will have both a grand world and a grand ai !