You're missing the point. It doesn't really matter what flavour text is appended to what they do to lift the lockdown, the key should have been that whatever it was it didn't just happen instantly, that it takes some time and that it had an effect on the tone/character/behaviour of the system! That way you're not just nullifying these players efforts. Instead you are letting them see that thir actions have a distinct and clear effect on the universe. It is all about having clear agency in the game.
First: It took some time to lift the lockdown. 12 hours at least. That's a normal and plausible reaction time. Why should it take three days and a complete halt of the operation to reopen the market? That makes no sense.
Second: FDev acknowlegded the player effort in an article and strengthened the federal presence in the area as a consequence. Like I already said.
Third: What kind of effect on the tone/character/behaviour of the system are you imagining? And are they even possible with the current BGS or would you need changes? Or are you talking about player behaviour? Please explain that point.
Fourth: What should have been is entirely your opinion.
I think we need a 'Blockade' state for the BGS. Killing of a significant number traders and system authority triggers first lockdown for some time, if it continues the Blockade state is triggered and overrides the Lockdown state. The markets reopen and system authority in the system increases. Delivering commodities and handing in bounties works against the Blockade, killing traders and system authority works towards it.
At the same time pirate activity should increase, too.
Or, if the controlling faction belongs to a superpower and there's a rivaling faction of another superpower in the system, a militia type of NPCs could spawn, which hunts down traders and opposes system authority.
This would require a removement or a reduction of the minimum duration of the lockdown.
Incentives for blockade running then could be higher prices in the markets for basic low price items such as food cartridges etc.
Could have some negative effects on the controlling faction, too. For example if the Blockade goes for a fixed time, let's say more than two weeks, the states Famine and Civil Unrest could trigger, depending on how sucessful the blockade runners were.
Just a little idea of mine, feel free to pick it apart.