People really are overestimating the amount you got from bloodbath. Bloodbath alone saved you from one, maybe two extra hits from a boss with all the healing it'd give. Even on AoE packs it just chunked your hp up enough with a single steel cyclone to last one more wave of hits.

If we wanna complain about sustain look at paladins, their heal that they can shoot off 5-6 times and has a very quick cast time shoots their HP up big time. Sure it doesn't damage but it keeps you alive more than long enough, which seems to be the concern with BB