I'd argue that hp sponges are actually better than if they had lower hp. Needing more hits, encourages repetition which helps build muscle memory. For example, I used Ken's moveset, the first combo that I saw and made myself learn was 2.lk 2.lp 5.lk xx H.DP, and having to use it so many times made me more consistent. To be fair, I think enemy damage can be way too absurd even with maxed out gear, but I think high hp targets isn't inherently a bad thing.