While I understand (I think) what you are looking for in a (this?) game, I would respectfully suggest you are taking this a tiny bit seriously. Remember, for plenty of people, it is just a game, something they do for fun, to relax, it's not real.
So, let's just say that FD decide to create a second, Open only game, and gave everyone who already owns it, and everyone who subsequently buys it, a second CMDR, to play the second game. Who would play that game?
1. Players who play only Solo? I doubt they'd ever use their second free CMDR, since they don't play Open now, it would seem unlikely.
2. Players who currently play in Groups or Solo? As above, I cannot see their motivation for suddenly using a game mode that they have no interest in.
3. Players who mode switch to be able to play with friends in Open, and other friends in Group? Well, they might, assuming all their Open friends decided they wanted to play this Open only mode, although they would of course be disadvantaged when they go back to playing group as their Group CMDR would not have progressed while they were in Open only.
4. Players who mode swap between Open and Solo to respectively shoot and avoid being shot by other CMDRs? These are the contentious ones, and in the main, they are the ones that all these arguments are about. They are the ones who apparently build up their credits and ships in Solo and then leap out into Open, or burrow away beneath the scenes changing the galaxy where no one can interfere with them. I honestly don't see them choosing Open only mode, do you?
5. People who play Open only now, such as yourself? Maybe, I don't know. You presumably would, but there may be other people who mode swap for entirely benign reasons, mood, Internet availability, amount of time free to play the game. They really may not see the benefit of building up and maintaining two different entirely separate CMDRs.
The fact is, you would like FD to force all those players to be in Open all the time, essentially to enrich your ingame experience, and I'm pretty sure they won't do that. In order to try and accommodate the widest possible player base, FD give us the ability to play how we want, not how you want, and not even how they might want.
It may not be perfect, but it is after all just a game. You are free to take it as seriously as you like, but you cannot expect everyone else to do the same for your benefit.