The optimal army composition changes from tech to tech, fort level to fort leve. infantry does take damage and after a few rolls you don´t do the maximum dmg that you would be able to deal. Optimally you should have a little bit more infantry then artillery to make the most out of combat width. As soon as artillery starts to do some damage I go for 10 inf / 10 art. In early game it is often 15 inf/5art -> I get 5 bonus for sieging lvl 1 capital forts and 2 siege bonus for level 2 forts. As soon as I can pay for 20 unit stack I start increasing the number of artillery and drop cavalry completely. In the beginning when I use below 20 units stacks, I go for 1 cav, 1-3 artilleries (to help with the sieges, not for combat) and the rest is infantry.

My army compositions take this into consideration, but also personal preferances and more so lazyness. If you want to learn in-depth mechanics about eu4 check out all his videos, they are great. It is a series of 4 videos about warfare. There is a very helpful video(s) about eu4 combat and army composition by reman. Later artillery deals the most damage, while being in the back row it protects your front line units and it improves sieges. Artillery in later game is much more beneficial and completely replaces my cav (I only use a few in the beginning of the game). Sure in a perfect army composition you take 1 or 2 cav in every stack, but they will only take full effect if you outflank the enemy.

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Patrician 3 patch 1.13