They cut 69-70 exp by 40% I'm not complaining
The renown change is offset by the increase in rep from certain quests
If you want to put the hate boner away for a couple weeks we have a ptr build coming today and some raid testing for you to complain about it giving people an unfair advantage
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The renown change is because early level rewards were meaningless
Think of them like the 3 point talents that gave X% of a stat
Now everything comes faster so instead of it being renown 7 before you get the extra quest line you'll have renown 3 which is 7500 rep
As for leveling experience it's because 68-70 was around 1.4m exp required while 61-68 was about 2m exp
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It's a mount
If it was a customization we'd be able to see that
As long as people give feedback we might see changes because we only have 2 dragons with full body transformation out of 4