I really like the research cost change for doctrines. Lots of techs really should have the ability to spend xp to speed them up, and others only be researched through spending xp like doctrines. I wonder though if getting the doctrine tech will be instantaneous or if it will take time but not use up a research slot or if it will be as it is now but hard locked behind spending the xp. I think I'd like the middle option best as it would prevent someone from just getting all the doctrines over a few months of heavy fighting, but also free up some of the burden on our research slots.