Android development: API has a bizarre malfunction. You hunt around the exact source version to find an obscure workaround, which might work or not. Most likely

Android development: API has a bizarre malfunction. You hunt around the exact source version to find an obscure workaround, which might work or not. Most likely you are screwed. Plus there will definitely be one phone model, were you are definitely screwed. iOS development: API has a bizarre malfunction. You are screwed. Both: You have a bug free app. Until 3 years later, when half the stuff you used is suddenly broken in the OS, the other half is deprecated.