We already have an easy solution to balance all the shiny new stuff: unit caps

Obviously CA wants to add lots of shiny new toys for us to buy, so just implement unit caps to prevent unlimited power creep. Teutogen Guard making the Greatswords utterly irrelevant? Just limit them to the number of their chapterhouses you build , while the Greatswords remain unlimited. Easy peasy.

Edit: Just so that I dont need to keep repeating myself in replies, I know all about the unit cap mods and use them, but they dont always work well with other mods, and arent always up to date.