to the downvoters, please, go here http://code.google.com/p/android/issues/list?can=2&q=typ... and count how many top voted, old, issues, have official google comments.

second, we have cases like: http://www.androidcentral.com/htc-patches-911-glitch-rogers-... ... there's also an old history about one dialer replacement app that prevent one guy from dialing 911 while he was witnessing a robbery. Those are all extreme examples. but since android allows an app to mess with core functionality, how do you deal with supporting something that should be extremely well tested, such as a dialer, that isn't even easy to be well tested by google or operators?

Third, there are several of the bugs i mention on step 1, such as some devices fails to connect to hidden wifi networks, that affects one or more app... what if you write an app that facilitates wifi connection for people on the go, and the user starts to waste your support teams time with requests for that platform bug?

All that said, i'm still an Android user and developer. I really think IOS is a worse platform because it tries to avoid most problems instead of solving, and that's just too delusional to be good. And Maemo is too closed to solve the problems in a sane manner.