DB is coming across as a bit of a griefer himself tbh

, especially if he also thinks that it makes the galaxy more challenging.
Anyway, if there was a game mechanic where someone could steal my ship, I (and probably hundreds of other players) will never, ever, be tempted to go into open which, in itself, makes DB look out of touch regarding what makes ED a pleasant experience for some and not others.
To go back to one of Bran's initial questions, asking what in the lore is there to prevent the theft of ships, I think it would make sense that breaking into a ship should be a significant challenge by itself, even without counting the owner's attempts at stopping it, or even the police. There has to be strong automated security of some sort there.
But your comment touches upon the bigger discussion of adversarial play between players, and ultimately no matter how hard you make it for an attacker, there will be those for whom such a feature would be an absolute turn off. That's entirely expected and that's fine, that is the exact reason we have different game mods to catter to different tastes. For the rest, it's all a matter of finding the right spot.
Not really trading - as I'd expect that the ships would neither be able to be sold nor replaced after destruction - it'd be more like a "use it 'til you lose it" scenario.
Clearly stolen ship shouldn't be replaced, but as for reselling them that's something that should be a thing IMO. We could use a black or grey market for used ships of various origins, both for buying and selling, with various quirks and such. However, because of the sums pontentially involved, from even just a pure PVE perspective, the challenge of stealing one would need to match the pay. Now how do you cram enough challenge, in the span of a single session, to justify rewarding the player with a new, potentially fully outfitted ship, that's of course something entirely different. Or, and this is something that would require a lot more persistence than we have currently, both wrt NPCs and the reliability of being instanced with another player, stealing a ship would be a task potentially spanning several multi hour play sessions where you'd have to shadow the ship to try and figure out a pattern and find the one right moment where boarding becomes feasible.
Having zero day accounts with top-of-the-range Engineered meta-ships would be a "bad thing" for the game in general, in my opinion....
Clearly even now there is an issue with ship progression being way too fast, but on the other hand the people that would be interested in fast-tracking to such a ship right away probably aren't interested in proper progression so from that pov allowing them to do so and probably quickly get bored isn't going to lose Frontier a long term customer. And since giving away your ship to a beginner is a clear, 100% loss for the seller, that's IMO already much less of an issue than the various iterations of seeking luxuries and Sothis and Ram Tah which do create money out of thin air for very little player involvement.
There is however the issue of insurance which could make ship theft one of the biggest money making exploits out there. So either the very actions by which you steal a ship would have to, at all time even in a multi-session scenario, be very challenging (so we're back at how to cram enough challenge in a small interval) even when the 'victim/seller' is doing everything they can to let themselves be robbed,
or stolen ships need to be inherently worse somehow than a ship you'd have legitimately obtained through trading, so that the price the victim/seller pays via their insurance roughly reflects the new worth (not just monetary worth) of the ship that was just transferred to the other player.
As to RMT, I'd expect that Frontier would remove any accounts identified as indulging in that practice.
That's alwyas been my take on RMT and why it shouldn't impact how the game is developped, expecially in a game like ED where players only interact at a superficial level and don't really impact one another that much, contrary to something like EVE.
RMT is against the rules, only those who take part in it should be punished. Legit features shouldn't be held back for the sake of stopping it, something that is impossible without stopping virtually all player interactions.