As your metrics show, many people are not getting rep/renown because that is a worldquester/xmog spare time solo vibe. But as your metrics show, many more players than that want the utility of flying implemented back into this version of the game.
Take out the rep/renown requirement for pathfinder, or bring back rep from dungeons, and/or pvp, and/or give us meaningful rewards for grinding rep if you really want this to be a positive experience holistically resulting in good PR, not just an option for some of the casuals subbing for pretty pixels.