You don't need to know how to play well

[Physic]

this is completely accurate, most people never learn to play thier jobs on the current system of sp gains. 10 level max difference, and behest on too weak mobs.
Then they think combat has no depth, mostly because they never have to play right, and never see what enemies can do, also they basically all stay at one leve area.
Combat changes are irrelevant if nothing requires people to use thier skills, previous sp system you got sp for fighting higher level stuff and doing actions that counted, so it was fine to have easy stuff, but now you get the most sp, fighting things which you can probably solo. and in a group die before you can pull out a weapon.

[Rentahamster]

previous sp system you got sp for fighting higher level stuff and doing actions that counted,

Well, not really. We just had spam casting cure I and sacrifice I, as well as using worthless TP moves just because they had a status effect proc that would add more SP.