For a while, I've run a rule in my game, limiting what skills I can pick.
Specifically, I can only have 2+2x skillpoints in each tree, with x being the least number of skillpoints in any tree.
Aside from meaning I can't quite rush to get a t3 skill as trivially as before the general idea is to let me use all four trees, especially combat, without feeling like I was making a bad decision. Combat boosts are fun, but poor investments compared to things that buff your whole fleet.
Getting a t2 skill requires 6 skillpoints, but 3 of those are "Wasted" on just unlocking the other trees. Practically it is 9. And 10 gets you a t3 skill, plus 3 t1 skills in the other trees.
The +2 lets you get the first level one one skill in each tree, and the 2x means you can specilize in a particular tree, or go rather deep for a specific skill.
Past that, given the different number of skills in each tree, anything less than 1.5x would kinda break it. 2x is easy to remember however.
This mod helps, because without it, you will cap out, and lose out on maxing out critical techs. And while that might be ok, the idea here is to be able to try different skills, instead of always getting the "Must Have" skills.
Skilled Up