I am left to wonder how a distribution error causes iOS 8 to constantly drop connectivity to both headsets, cellular, and wifi, leaving the iPhone ALMOST as functional AS A WALKIE TALKIE.
LOOKS like garbage, WORKS like garbage, IS... someone else's problem? I think not.
This is something I suspected when the glitch came to surface. The OTA updates are diffs, not full firmware. If you produce a bad diff somehow, you get something you didn't expect as a result. In this case, the ability to talk to the wireless chips was crippled.
And so distribution can certainly be an issue here, is Apple's fault, but would be harder to catch in testing. Especially if they got to the point where they simply assumed their distribution system worked as expected. Since they've been using it since iOS 5.0, I'm not surprised they'd lapse here and assume that it'd "just work" 3 years later.
It also explains why people who updated using the ipsw of 8.0.1 weren't affected.
I wouldn't take Joswiak's comments as "It wasn't our fault", but rather "We didn't catch this because it wasn't the firmware itself that was broken."
EDIT: Note that the 1.1 update way back in the day was also a diff, and if you used a baseband SIM unlock that patched the baseband to accept any SIM, the 1.1 diff would knock out your cellular radio like 8.0.1 did, only worse. Apple switched to full ipsws for years because of that one just to avoid bricking jailbroken devices going forward.