My two cents are that there is a difference in endurance strength and muscular strength. I think that with taijutsu we obviously need endurance strenghtening. Weight training doesn't necessarily produce bulk if that is not what one is trying to do. It all depends on the type of weight training being done.
I don't see how merely doing taijutsu would increase endurance conditioning. And to propogate the notion that no endurance training is necessary or it is of no value is being naive. I think we need a balance of it all. Technique, endurance strenthening, and muscular strengthening (not bulk, ripped abs, protruding muscles like some might misinterpret it to be.)