for pvm there literally no point having block, 75% of the enemy you encounter are elemental based. so all in vita. pvp max block are needed if you play serious gm duel
the only damage that matters is the stuff that can actually kill you
de seis mobs, stygian dolls, black souls, dark archers, etc
There is plenty of reason to go for max block / max dr / tgods / wisp / dwarf / hotspurs if you want the tankiest pvm build possible that won't die when you disconnect
ie someone going for 99 HC