The game, as is, puts a heavy emphasis on its grid-like design. Everything save for the planets, is generated around this grid. Although it is space, everything has a natural up/down/left/right/forward/backward positioning. the planets break all of this and feel very out of place. They don't fit in with the rest of the game's design, they have ugly gaps between sides, and take forever to generate, etc. I don't feel I can properly interact with them in a natural fluid way like I could with the disc planets. They seem very intrusive, and as I said before, I have zero desire to ever visit a planet for any reason.
Quite honestly, this one thing is the reason I don't play as much as I used to.
I'm not saying others can't like them, nor am I saying they can't work, but there doesn't appear to be any effort to make them work better with the rest of the game, and its very... saddening.