I think this pretty much sums it up for me. The thing is, if you're also trying to go through Rationalism and your ideology tenets, I just don't have time to go through the whole Commerce tree (or the whole Patronage tree). If I prioritize those, then it'll be far too late in the game for me to make much use of Mercantilism or Protectionism. I think that's the reason I prefer Patronage.