The tier system and attributes system isn't really a completely flat progression, it's still very similar to levels, only that you don't have as big of a progression and there's a lot less levels. Say there's 3 tiers in EQN eventually, that means there's basically 3 levels. 1, 15 and 30, to use normal levels comparison. It might be closer to 1, 5, 10 though depending on how they balance tier stuff and attributes and what not. Point is someone who has played for a while and has all the additional attributes with all the weapons that boost all the right skills is most likely going to be more powerful than the newb who just started, at the very least for that particular role(pure dps, tanky dps, support dps, control dps which seems to be the type of archetypes you're gonna get).