Exactly, Why wouldn't it have shown up during beta even GM week? I find it hard to believe no T-Moblie users were using the GM prior to Tuesday. Something weird here.
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Maybe so but how do you NOT test a failed cellular signal? Just curious?
I think a few issues slip past and/or are tagged on to something else unrelated. With the current state of Apple's testing, anyway. There are also fewer people running the betas that know how to work up a proper bug report (public betas and all).
If it didn't deal with iMessage, Siri, cameras, or Apple Music I'd bet Apple knocked it down a level of severity this time.
Ultimately the responsibility lays directly at the feet of Apple since they want control of everything.