So generally you bothered will all general skills lol!
And blocks is something that BB not bothered, but not supported means, don't open ticket because block fail, if they do support they will get a headache and waste time that better to spend on something else, so yes, they featured it, no it is not supported, as for example read MoD general description, in PvP they support block even in the help, when you do tutorial they suggest to do that.
For reduce boss hp, actually you really need to know about bosses with like 250K - 500K and even 700K hp (sea snake)?
do you know about 250Kx2 in oil lamp? my Anselm takes like 34 rounds (yes about 11-12 minutes!) to finish the battle
And why you think player will be able to use these skills, or they will be able to enable them all?