Since orbital mechanics isn't necessary for any stage of flight
it actually is for station approach. if you're like me and enjoy planet braking, fast entries and fly-bys, knowing if a station is actually in front or behind a planet is crucial if you don't already know the system. orbit lines give those clues. also, sometimes it's interesting to look at the orbits. (*)
everything is nicer without, but i have made it a habit to turn them on as needed.
* actually, i would love they got some love, they are very raw. the plot could be way smoother, and orbit and body information could be displayed on them. think of it as a live orrery overlay, wouldn't that be cool?
edit: ok, that's not actually orbital mechanics, but the orbits themselves.
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