Firstly, I don't think apple care about who uses a GM release if anything it reduces their server load come launch date. Most average users or the public as they are now called wont go to the effort of obtaining a beta or GM version.
I however am a Dev and thought this thread was actually useful to highlight any outstanding issues. Of course youcant expect fixes prior to a public release but no one said they should be.
Anyways 4.2 seems to have returned my 3g to a useable state so I'm happy.
Haven't found any major bugs in the os yet either