I added this in another thread about leveling speed, but I'll add it here for visibility.
Right now, there simply isn't enough "journey" to the leveling zones and content to warrant a slower leveling speed.
At least on Trem, dungeon crawling isn't a thing. High levels camp Named spawns during most of the normal play hours.
World drops are boring or non-existent. Corroded Bronze loot isn't exciting.
There isn't much reward to the journey right now. You even have weird gaps in gaining new skills/spells: why does the Necro have nothing to learn from levels 5-7, then like 6 spells to buy at level 8? It doesn't seem like intentional design- it seems like a lack of one.
If the game is about the journey, the journey needs to be fun and rewarding. It currently very much isn't.