Will attempting to create the best experience for PS3 users on Dawnguard cause MOAR bugs?
Well, just some perspective from my own experience:
I have both an isolated gaming rig and an Xbox360. I enjoyed the base Dawnguard dlc on 360 but will not be purchasing it for my pc version. It has some 'features' that I loathe as far as gameplay. And some other glitches introduced, while not game-ending, are just too odd to explain.
To be sure some of these things can be modded for my pc version, but that's not the point. The point is that they shouldn't have been introduced in the first place.
Sloppy coding and QA, plain and simple. I have other things to enjoy on my pc.
While I have empathy for those waiting for this dlc on ps3, I wouldn't wish these 'features' on the unsuspecting. The furor over further delay will persist but, I assure you, it's nothing compared to what would have flooded the boards with a more buggy dlc than has already been on the 360. It's hard to relish in the knowledge of a future dlc that will be less buggy when you want one now, but what would arrive now would ruin your Skyrim experience...further.
Hope that helps
Patience is a virtue often hastily sought.