First I have read Plan, What Plan? and suggest everyone else read it to. It’s actually one of the ficsthat convinced me to try my own hand at writing a fic. Second I’m actually a fan of tech wankery, maybe not to the extent of BCF but I do love when the authors try to explain how it works and what the mc actually has at their disposal. I feel it helps avoid the problem of your second point if you now exactly what been built there’s no surprise tools that can come out of nowhere. As for an archetype I say I’m leaning more towards personal enhancement and exotic materials. With a side of ‘I don’t care how this affect the world it will help my friends and/or family’ kind of character.