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.
91 318is - M50NV (gone)
02 WRB Subaru WRX EJ207 forged, 320 AWHP stock turbo.
85 - 325
02 325i Sedan