I don't think that the debate is really between a 100% common fixed solar system and and 100% random/procedurally generated system, different for all players. The ARM update shows the way towards a balance between keeping the current 'known' solar system as is for all players, and adding some element of the unknown and exploration with one or two extra procedurally-generated bodies outside the known system. This would allow players to learn all the core elements of the game from the community by having how-to guides, common reference materials on orbital mechanics, transfer windows, etc, but also give an opportunity in the late-game for unique player experiences with greater elements of risk and independent problem-solving, since no one would have gone to your particular generated 'new planet' before and uploaded simple instructions on exactly what you need to do to get there.