The sandbox feature was already shelved due in large part to a 10 page thread championed by players who haven't even set foot in the game. Considering the fact that people periodically ask about it on discord and are disappointed to hear that it's been scrapped, and the fact that it was controversial even in that ten page thread, this isn't hyperbole. If I stop responding to this thread it's because I'm tired of posting 100 words and receiving 1200 word diatribes to wade through, not because there aren't people in the community that would like to see a sandbox.
He pointed out your usage of "tyranny" is hyperbole in context; players, and forum posters at that currently, have no power to impose any system on any game. You do not need to set foot in a game to know if it will be good, or if it will have flaws. Most people see a game trailer and know from that if they are interested in a game - they do not need to play it first to really know. People can see something nice, having never had said thing before, and like it, and know they'll like it, before buying it.
Likewise, of the thousands of games that have existed over time, certain things work, and certain other things don't. If Starbase is to become an MMO, an offline server mode for ship editing and flying around your own personal universe is detrimental to the MMO experience. You seem passively upset that the devs are attempting to craft their core gameplay around their own idea of having thousands of players interact in the same game universe, and are not instead making an offline sandbox for you to play in the sand within. I am not mad at the presence of safe zones, though I'd prefer a game without safe zones if at all possible. I recognize their need in the gaming market, and have gone so far as to realize and suggest that the safe zones need to be massive, so potential malicious players have no opportunity to mess with anyone who just wants to live inside the game world without conflict.
If you think an offline sandbox is somehow better for the MMO experience and for the longevity of the game, then present why - calling forum posters tyrants doesn't really further any discussion. As someone who is often a lurker on game forums, I know all too well what happens when the vocal minority screams and cries and begs for some feature and gets it - failure. No one here is screaming or crying or begging for a feature. Instead, people are pointing out that with Starbase, the things people want, like a ship editor, can be present in the single game universe that everyone else exists in, which will bring the game alive as people get to see each others' creations. In other words, if the net result is basically the same thing - design your ship in game much like the station designer mode (as Atreties pointed out), and that can be kept in the live game for others to be a part of, why not include that into the main MMO experience, and not have players dipping offline all the time to their own personal retreat? The key point is if the game doesn't have people moving around and doing things in your online virtual city, the game feels empty and people leave. Everyone is valuable. If the desire is to be an MMO, they need to not split their vision and resources into multiple game modes. They need to focus on one unified game experience for everyone.
I am not fond of people crying for features; it does often lead to ruin for games. My approach is to point out past successes and failures and point out, "If this is the goal for the game, these are the things that have failed in the past with other games, and these are the things that have worked in the past for other games, so we have some evidence of these things being good or bad for Starbase." It is then ultimately up to the devs to decide, as in all games, how to proceed. But my intention is nothing except the best outcome for Starbase.