Just something to consider:
If block breakers would cost 1 bar, characters with insane pressure like Lao, Tanya etc wouldn't even have to block anything since they build so much meter on block (on top of insane chip), they would just break anything and everything. That would broke the game. Lao would be totally broken (not only semi broken like now).
Anyway just my 2 cents. Also i wouldn't expect any attention from NRS in this or at best you gonna be sent to Paulo fav. quote, coz you know he/they know best.