Just to add my thoughts to this big thread...
As many already said, the patches were not really needed to make the game stable. Sure, there were some bugs in it but after 1.1, the fixes related to minour issues. There are still some left (mind control center?) but they don't break the game.
Everything after 1.1 focused more on player feedback to make the game last longer. It was about gameplay. The simultaneous attack/defence is a good example of this, as well as the fiddling with morale and population growth. Stardock tweaked the game so players wouldn't be able to 'crack' it so easily. With cracking, I mean seeing a set path to victory that requires little or no thinking. Fast ships with lots of weapons were the norm in the early days for example. Now, things are more nuanced.
Also, the game prides itself on it AI. In strategy games, a fair AI will always have a hard time since players can adapt over games whereas the AI can't. Stardock's commitment to including new strategies based on player information is to their credit. Every time the game changed, player strategies had to change and then Stardock adapted the AI to counter that. Of course, one can only go that far in it but I don't think anyone can claim Stardock doesn't care for its customers.
Some companies do the same, such as Blizzard while others release games that most people can get running and then they make a half-hearted attempt at patching things, sometimes leaving more destruction in their wake after the patch. It is a sad thing indeed when you find that the copy-protection software was the only perfomant aspect of the game and even that would at times lock up your PC.