I think that it has to do mainly with two things: 1. The overall complexity of what's possible is growing, so software is just becoming much more complex. The

I think that it has to do mainly with two things: 1. The overall complexity of what's possible is growing, so software is just becoming much more complex. The other is the fact that server based software has an almost zero time deployment cycle, and even native code for desktop/mobile can be shipped really quickly. This makes software mostly an iterative process. If fixing bugs on a weekly basis in a major mobile app is no biggie, and almost nothing gets blocked because of a bug that can be just fixed next week, you just get a lot more bugs shipped to users.