There are a few cases of micro-techs in the tree, like Impressionism, Expressionism, Dada, Surrealism, Modern Art, Realism, Pop-Art, and probably a few more (I don't have the game open right now). And art is not exactly the center of the mod.
OTOH important technical developments (e.g. ball-bearings) don't have their own tech. Modern Warfare and Guided Weapons (techs with direct consequences in the game) could probably be split into half a dozens techs with better reasons. There are less techs about computer development than techs about the development of modern art.
Please don't get me wrong, I don't mean to belittle the massive work done in the tech-tree, but if anything has to be cut, please take down the micro-techs rather than, say, Writing, Hunting, or Iron Working. In some parts of the tech-tree, every tech seems to have a massive value in real life (or supposedly a massive value in future real life) and many consequences in the game, in other parts they are more like stepping stones.
Or, if you have to keep the micro-techs, please deviate from the tech cost table. Using unified costs for each tech implies the techs having the same "size", which right now means the development of the modern computer has about one third of the costs of the development of modern art.