Well, you could get 40% with the upgraded tower shield from Gerolt, but there wasn't a higher level tower shield than that. There wasn't a higher level buckler than Diamond, for that matter. We're only a little behind right now. Prytwen is 22%, and I seem to recall Holy Shield being something around 21-24. Gordian shield is 29%. I doubt we'll catch up to shields in their heyday (Diamond Shield with crazy STR giving like 40% block rate with 20+ power) but whatever. I don't like that they dumbed down stats even further, but it's not like it was really a choice before.
Rather than just straight up buffing shields, I'd like if a stat could modify power or rate again - just not a free stat, like STR was. Maybe attach it to parry or something. Anything to get some real mitigation stats going.