Until you bring the online services side into the picture. A typical app depends on both OS APIs and remote service APIs. Keeping the latter stable and suppor

Until you bring the online services side into the picture. A typical app depends on both OS APIs and remote service APIs. Keeping the latter stable and supported is harder. Especially when there are third party services and frameworks involved, which there inevitably are. And whereas no-longer-fixable bugs in an app might be work-aroundable, merely annoying, or outright irrelevant to some use cases, bugs in a service/framework can easily be security stuff that can take down your whole business or land you in regulatory hot water.