I would also prefer for more time for bug fixing and polishing.
However, there are factors in the game business that I am only vaguely aware of that dictate the timing of releases (for example, I would guess that it is not a good idea for an indie game maker like Stardock to release a game during the same week that some other major release is happening). Brad has been in the business for a long time, and I'm sure he has good reasons for timing the release when he has.
Additionally, while I would like to see LH be as close to perfect as it could be, it already compares very favorably to other games of my experience. Skrim, for example while released quite some time ago and with several released patches, still crashes on me regularly, and requires numerous "unofficial patches" to fix problems the developers haven't seen fit to address. LH hasn't crashed on me for several beta releases now, and Stardock has an excellent reputation for fixing bugs post release.