I don't think they've said anything about releasing the game early, then patching it later to add major features promised in the KS (such as NPC schedules), so I'm not sure where that suggestion is coming from. And considering the amount of work that seems to remain to get the current features working properly and the game (virtually) crash-free - let alone to get the additional features added - I'd personally be surprised if it releases before September/October.
That said, while I'm also really looking forward to the full game, I'm extremely pleased the devs are unwilling to release a rushed and therefore buggy/unfinished product. Larian doesn't want to repeat the experiences they had with publishers in prior games in the series - and without a publisher forcing their schedule for D:OS, they can take the time they need to release a solid product on day one.
