You know what is immersion breaking? Everyone else getting to fly around while I sit my ass on the ground because apparently the air just hits different when it comes to my mounts.
Jesus, just let people fly with no barriers or massive gold sinks. It really isn't that hard to understand or get.
If the game is fun, it won't matter what mode of transportation you use. It worked that way for years before we had to 'compromise' with the time played metric.