Lynxes:
I agree with you. If you build a strategy around killing the UK destroyers the first turn, then yes you could benefit a lot from
building a few subs. And by all means, that might be a very good strategy to keep the Uk out of France etc.
However, my point is that you have to set up a strategy spesificly designed to use subs. If you dont, it will probably be stupid to build subs. And if UK builds a Carrier and a few subs herself first turn, in turn 4 and outwards it will probable be completly stupidity to build any more subs as the German player, regardless of earlier strategies.
As of IC repair, yes, I did not think of that, and that way IC repair might not be that far of. Still I find it somewhat disapointing that you need one tech spesificly for germany to counter one spesific strategy. I would much rather see technologies which could be usefull by everyone, regardless of enemy strategy.