Just to throw into perspective here.

Western Thanalan is one of the locations of the Atma. Considering any new Gladiator, Pugilist, or Thaumaturge starts in Ul'dah, if they want to do FATEs in Western Thanalan, they will never get to the lower level ones in time. For example, running between the Level 13 Bubbly Bernie, and the Level 9 Cactuar Jack FATEs, especially if they don't have a mount. Until Gladiators are 15, they can't run dungeons, so they are stuck with FATEs or leves. Also considering that back when we were new players, we farmed FATEs for seals too, to get our chocobo permit. So new players have to use separate leves for EXP and seals.

The only ones who can make anything out of it are people who are leveling second classes there (ie. they would already have a mount at that point of time). That's the main content of the OP - these low level FATEs which were not usually ever touched by players outside of its level range, are now being cleared out by high level players in chase of their Atma, at the expense of the newer players.