[WALL OF TEXT ALERT!]
You make a lot of valid points and I agree with you on some of them but personally Iād say most of your suggestions would make this game more of a solo grinder (which you, yourself are against). I think the experience rates are good the way they are and as a strength cleric I donāt think itās a hassle to level up at all seeing how you are taking the path of most resistance for the huge reward you get once you hit Monk or Paladin. Increasing experience so you can reach rank 3 or 4 with in the first 5-10 hours(can hit rank 3 in 16-20 hours currently) would make the ranks feel cheap and less rewarding,
Also increasing the experience rates that high would make the early game of this game into a theme park quest grinder(WoW) which will put off people once they finally hit that grind wall miss leading them they wonāt be that attached to there characters at that point they only spent 5-10 hours on it didnāt work for anything since quests did it all. I personally think that showing off that this game is a grinder in the early stages of the game will help people understand what they are getting into.
I also think that getting into those grind group earlier rather than later would be easier for the new player while they are still learning the game and getting to know new people earlier rather than later helping them make it into those late game grinding groups with friends they already made along the way.
The game needs more experience but just increasing the rates all together would hurt it more then help it. I personally think that zone bosses should give a ton of experience a long with other means of gaining experience over just increasing rates.
This is only my personal opinion of course no fact behind it.
TL;DR: Increasing the experience rates for release would hurt the social aspect of the game.