I don't know why they never scaled fate exp and challenge log entries for fates to scale decently after 50.
It's clear they never intended for players to use fates after 50 for leveling, but I don't understand whyyyyyyy, because they never gave any other incentive to do them.
In SB they did tie a few mounts to a few of them, but mounts were never enough incentive for me to go out of my way and now SB fates are just as dead as HW ones.

I know they want dungeons to be the fastest method of leveling, but they could quintuple post 50 fate exp and dungeons would still be superior since they give in the range of a measly 1% exp needed.