Ive been researching a bit, and I found out in the 1.9.1-.3 range of updates, you can still spam click, instead of the 2 sec cool down or whatever, you can do a good deal of damage while spamming, a skeleton could be killed with 4 hits, from minecraft 1.8's 3 hits, virtually no difference if your taking into consideration "spam."I think the 1.9 update for Minecraft ruined the PvP side of the game. I would personally not like to see this update on kit PvP or factions or EG. 1.9 would bring a fun new aspect of Minecraft but in general the PvP got messed up.
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