Adding flying itself would implement a number of new requirements for things like combat. Right now all damage states (I’d imagine) would be in a 2d state. Adding flying would require a lot more work to get combat done correctly. Especially when you consider abilities will impact the environment. I personally think flying would over complicate things for very little reward. However, I do think special biomes “in the sky” would be pretty cool. Could be players trying to get a connection with their deities. Sky cities and all that