Right from the start Android has been designed with a form of Responsive Design. With scalable XML layouts, and selectors to choose which layout is loaded for different DPI devices, one could argue that even early versions of Android are at least as design-friendly as modern HTML5.
That's not to say there aren't challenges. But the whole point of Android was always to create an industry standard for a wide range of devices. This requires - by definition - support for a variety of screen sizes, DPIs, hardware features, etc. When most people talk about fragmentation as a negative point of Android, they're forgetting what Android is. A common platform, running on an unlimited number of devices. That's by design, not accident.
That's not to say there aren't challenges. But the whole point of Android was always to create an industry standard for a wide range of devices. This requires - by definition - support for a variety of screen sizes, DPIs, hardware features, etc. When most people talk about fragmentation as a negative point of Android, they're forgetting what Android is. A common platform, running on an unlimited number of devices. That's by design, not accident.