Ranged troops are too strong in this game, especially burning shot and trebuchets which also makes Strategists way too prominent. So here are the suggestions to change that:
1.Burning arrows and explosive shot should be temporary buffs like in Shogun2 and maybe available in every battle twice at most
2.Lower the firing frequency of all ranged troops, excepting Repeating Crossbows (so there's actually a point to them). I have not played a single battle where my ranged troops didn't spend all their ammo in the first half of the battle which is highly dubious. -50% reload speed is a starting point
With those nerfs the Strategist might also not be such a dominant part of every army.