I guess it depends. If running cams with heavy overlap you never idle that low. Out stock cams however are a long way from having any overlap (the reason they suck) so they can actually run a lower idle than that. The reason our idle isnt a lower setting is due to the lack of pistons, the fire events are so far apart the engine is far from smooth. If running autotragic transmission the higher will cause more ware on the trans. The clutch packs will slam when removed from p/n causing stress on the hard parts, and the higher rpm will cause more load on the torque converter when at a stop creating more heat, resulting in torque converter wear and accelerated fluid breakdown. The higher idle will also higher tail pipe emissions at idle. To low a idle can also impact emissions if the engine is unable to run smooth. If you can deal with the increase wear and noise, then I guess it isn't like really necessary. The increase in wear is kinda mute, it will wear anytime it is in operation.
Sorry for the late ass reply haven't been on here for a couple years haha but thanks for all the help dude I appreciate it