Quite honestly, I think the real problems might be the following two, neither being mutually exclusive...

#1: The spacing of the markers is awful. Moving specific markers further in/out generally helps with specific mechanics such as Snakes landing on some spots, or trying to find a very specific ground spot based on arena textures

#2: There are more markers in the arena than needed causing them to become a detriment or pointless rather than a benefit. This depends on the fight/arena as various arenas happen to have very deliberate floor murals to indicate AOE sizes

My rule of thumb is at minimum you should have a North and optionally a south marker for reorientation (exception: Alliance raids with ABC marker layouts for specific fights), the rest is optional.