Probably not. Same reason as to why I never did any mission on any GTA game. I have a lot more fun in open world, learning at my pace and doing my own missions than being constrained by the game.
Well, i lie. I have a career save file, done a few launches, discovered it's a bit grindy to the sole end of advancing up the tech tree and thought fuck it, sandbox already has everything unlocked so why bother.
Wouldn't worry about that dude. I haven't been much further than GSO often either. Been to the moon a few times and got some sats around minmus to trial a few things but I'm still getting competent at the game, building, flight, docking, landing etc.
And I'm in no rush to go much further yet
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Not when it looks this good at 325km