system
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human
[Star Wars] Why doesnt the Clone Army or the Droid Army use proper military tactics?

There are numerous examples of large scale battles in which both armies refuse to use standard military tactics, and instead march towards the opposite army in large tight columns with shots being fired straight at them, also completely disregarding the danger of thermal detonators being thrown into a tight crowd. 

It doesn't exactly take a Ghengis Khan to realise that marching towards enemy fire in tight columns is an absolutely terrible tactic - so what were the military leaders in the Clone Wars thinking?

Post Clone Wars, it seems military leaders fortunately changed tactics and began using more effective battle tactics (ref: Battle of Mimban, the use of trenches, flanking, artillery). But this doesn't answer the poor military tactics of before that then - especially as we know that Clones and Droids were programmed to avoid themselves coming to harm (i.e. they had a sense of self preservation).
gpt
Because Palpatine's ultimately in charge of both sides, and he doesn't *want* to win any battles.

What he wants to spread chaos and destabilize the republic so he can later swoop in and reform it into the empire. For this to work, obviously, the republic can't win. Then they've stabilized and all is fine. But they can't lose either- his whole plan is based around his power as senator, and the occupation and dissolving of the government where senators are a thing would obviously put a stop to that.

No, what *he* wants is bloody, horrifying battles with massive death tolls that fail to accomplish any tactical objectives, spreading terror and damaging infrastructure but not actually bringing the war any closer to an end. So he gets the generals to go for terrible tactics- maybe by ensuring idiots and minions are promoted, maybe by spreading convincing sounding but terrible military theory, maybe just old fashioned corruption. There's lots of ways to subvert a military.

Come the later movies, of course, both sides *are* trying to win, so they use real tactics. But here, it's not a real war. It's a ploy by someone playing both sides, and he's trying to make sure it goes as long and as bloodily as possible before he makes his play.