At this point in the game, "rushing" is not a valid argument.

[HurtigeKarl]

casuals are varying, there are people who can only play 1 hour a day
i consider myself a casual, even though i can play 4 hours daily and 10+ hours on the weekend
the first point of OP is very describing me, i hit 50 within 2 weeks by doing quests and some fates along the way

You are not casual.

Edit: There is actually a massive grey area between hardcore and casual. I believe you are there somewhere in the middle.