I disagree with doing the sp/xp thing like that. It is what destroys the community in games.

The rewards need to be much better and a little reward of sp/xp like 500-1000sp I can see. but to give like 2.5k-6ksp for a quest would turn this into a solo only mmo.

I think quest should be part of character progression that I completely agree with but not the leveling part of progression. Have quest unlock ones with better rewards, unlock new areas, unlock new abilities, unlock a variety of things.

But making it where people can purely level up on quest would be a disastrous effect to everyone who wants to party before endgame. While the ability part will still be there with the whole playerbase soloing quest it would pretty much end any chance of grouping at that point simply because there would not be enough people to do it.