Actually, given the time left on the countdown I'd say we're way past feature lock -- all they have time for is bug-hunting. And, on top of that, let me point out that skirmish mode in this game has a lot more in it than most campaigns. We have in-game diplomacy of some kind, the bounty system, the new economic model they've promised us to go with the new diplomacy system, piracy, and devs only know what else they plan to throw in.
A lot of game companies do their crunch time to get a lot done in the last month, hell they could even just put off the release instead of giving us Sandbox RTS.. And all that stuff you've explained, yeah I've played it all before, thats basically a skirmish in any space RTS I've played, it's nothing, it's what most companies make for people to play on the side, hence it is half baked, hell they already have the mechanics for a great game in, why stop half way?
Sure Sandbox might be good for SOME people for SOME time, maybe even most, but just you watch the community will be good and strong, at first, but as people get more and more bored with playing the same game they've before (Sins isn't the first of this Genre) it'll die off virtually instantaneously after a few months, 7-8.
It's a huge mistake releasing something with a few neat details, and no strive, purpose or real reason to play, people play RTS campaigns to get the feeling they've won, and now a days any of the RTS's without stats online, die off it's simple, Gamers are bored of running down the same corridor, just to run through another one. Yes I am aware there is no running or corridors in this game, it's a metaphor.