How many voices? A dozen? A couple of dozen? Out of over half a million players. Hardly significant. And there are just as many on both sides of the debate. The rest don't appear to feel strongly enough about it to raise the issues.
I'm not going to respond to every point, we'd be here all night, and it's too hot for that.
1) Why does the galaxy feel empty in Open? You assume that it is because everyone is in Solo/Group. Why do you never consider that people are just spread out over 400 billion systems?
2) & 3) are the same and conflict with 4)
4) We understand that you want a game that is about direct action but this is not it. In order to change the game to be what you want you would have to remove Solo/Group from your galaxy. This will require twice as much storage space, a separate GalNet, separate Community Goals, more Dev time to monitor/manage the data, write the narrative, and keep track of everything. That means less development and more costs. Now everyone is at a disadvantage, just because you want to change the game to something that you want.
Your solution does not make everyone happy despite what you think. It makes you happy and people who think like you. It would make lots of other people very unhappy because you have changed fundamental core features of the game that they bought. How would you feel if I changed the colour of your car without your permission because I like a different colour better? You would be a little annoyed I would expect.
I deliberately left that post alone for over an hour to cool off, lol, it was not going to end well, after it was explained (and cited) that being able to change modes on a session by session basis has been here since KS (that little project that ensured the game would be made, what FD asked people to invest real cash in originally), and still here 6 months post launch, 1 week old Dev quotes etc and I read "take abusive advantage of jumping between modes" well I need say no more. (and I had to limit myself to just 1 to comment on).
I do applaud you on your ability to explain things eloquently (although Jockey trumps you on pure facts on the leader board)

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With your communication skills, patience, ability to deal with nonsensical ranting you should really consider being a primary school teacher

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Ps, he did learn something "We" looks better than I, next question how big is "We"?
The funny thing is I have an Asp, Type6 & Vulture, no big ships and I do play in open more recently in the Type6 mainly, if I do I am not bothered about the rebuy or cargo (including rares), I can rebuy the Asp 30+ times, type6 >*4, I play how I want when I want for my amusement.
If FD linked forum accounts to game accounts, and allowed the blocking of players in the game through a button on their forum icon I think I would play open a lot more often.