"One hit stuff", are you serious? We know 1% or less about how skills will work and you already assume the difference in skill will be 100 hits to kill someone vs 1? Are you mad?
You also say it will ruin PvP, which you know squat of because you have not tested it!
You also say "someone could make a mob grinder" when you know squat of how XP will work and that no XP will be dropped unless you PERSONALLY kill stuff.
two comments, in pvp right now it's about 6 hits to kill someone, so the gap between one shotting and not is pretty slim, that's assuming balanced armor of your opponent, if they have less than the same tier of your sword + the option of crits you could already get about 2 shotted.
and yeah, idk, people were panicking that mobs wouldn't drop items with mob grinders anymore when they heard they wouldn't drop xp, seems pretty public knowledge.