3. Whm is old fashioned healer, while scholar is mainly keeping barrier healer..
4 &5. Well equipments are cosmetics~ I meet some people who actually prefer to craft rather than going to raid, and that means this game offer both enjoyment for warlover with peacelover..
So in conclusion, it really depends on the players, there are just some specific jobs which one can be easily mastered, while it's harder to master another.. I'm just better mainly in dow job, because i just like to move around and dont like to see cast time.. And in dungeons, i'd prefer warrior with easy hate generating but would choose paladin for single target raid for easier mitigating damage and party demand. in twintania, if i missed inner beast during death sentence, it would be wrecked without stoneskin and barrier, timing is everything.. But when i'm using paladin, i can even watch and relax the fight.

Tldr.. Screw 1000 chars limit.. I'm gonna post one liner for now on..