Its a huge change to the game, though, and it may make expansion feel unrewarding and frustrating. But I'll give you it seems to have support from most players here, at least the theory does.
It actually is great change, from the "expand everywhere" EU3 pre-DW, grab only best provinces and leave rest to vassals in EU3-DW, to EU4, where hopefully, expanding too fast can leave situation where you can not effectively develop nation, since it is too large, and determining how much you want to expand an important choice, that an not be easily determined due to the random nature of monarch skills.
In any game, focusing on a single aspect too much can bring you big troubles, really fast.
Right, but that is what seems so counter-intuitive; spending more on building up your country should make tech progression go faster and not slower.
Not really.
The EU "techs" re no technology in common understanding, but a set of regulations, rules, traditions, and other things that effect
effectiveness in particular field.
If government is too busy to look and change the fundamentals of economic relations, government institutions, and such, you end up with large, but old fashioned army, navy, economy, and so on.
Sink about it as focusing on getting more of same, or or focusing on making what you already have better.