There hasn't been any major version of iOS without a lockscreen bypass in some version of it. 7.0 had one that 7.0.2 fixed but 7.0.2 still had one. Then 7.1 fixed more but still had one. Then 8.0 had one that 8.1 fixed but 8.1 had a different bypass. Then 9.0 had one.
I'm talking about on-demand crashes. There was and still is nothing I can do to make the iOS 6 Springboard crash. Meanwhile I'd been doing this from iOS 7 to 8.1:
When I found this in iOS 7, people excused in because 7.0 was early. Then 7.1 fixed. Then 8.0 broke it again, as you can see with this being on an iPhone 6. It wasn't a matter of luck to make it crash. I could do it whenever I felt like doing it.
I would have hoped 9.2 would have been like 7.1 where these kind of things actually get fixed.