Questions

[koager]

slice'n'dice is a 1h skill
power hit is a 2h skill
so 1h people would put points into slice'n'dice and deva (tankers may also add points into mock and kick). but I think most people still dont empower slice'n'dice. if youre using 1h you can buy level ups for it but the points would still be better spent elsewhere.
2h people would put points into power hit and deva

using a 1h+shield will cut your attack power
it may be good for soloing but its mediocre for a party
people are given roles in a party. fighters either tank or DD. Using a 1h sword + shield but with DD stats would mean that you cant kill as fast as a pure DD and can't tank as well as a pure tanker.
the other nice thing about using a sheild is that if you add 50 into end you get +1% block rate. since youre are going for a DD build you would lose that