There is a considerable amount of E92's out there, and a shop would see a lot more then a forum would.
I'm not saying it's not common, but with the plethora of E92's I see every day, I'm saying I've yet to see one with a shattered sunroof.
And it's not BMW tech's decisions, if they had their choice they'd put a sunroof in it everytime. It has to do with the big cheeses.
85 325 - 2.8 PTE6262 VEMS.