It’s a pretty significant nerf to Flight Form in that case. While in Flight Form with Skyriding enabled, you can’t interact with nodes in midair like you can with TBC flying nor are you able to quickly Shadowmeld and liftoff like you could before either.
I would like to be able to choose which of my mounts (including Flight Form) are Skyriding and which are legacy flying on a mount-by-mount basis. Skyriding is my default mode of travel and I use it most of the time, but there’s still lots of use cases for Legacy Flying and the system we have now is a strict downgrade to what it was just yesterday.