It is exactly the failure of Microsoft and Apple to propose any meaningful cross-platform API. Both are fighting to increase vendor lock-in - it is in their best interests that apps written on Windows don't work on macOS/iOS and the other way round. Linux/OS folks themselves are unable to solve this problem on their own and it becomes a mouse-and-cat game.

The popularity of web apps helped to reduce the problem, but it still exists. Electron is only half a measure because the technology used is inefficient resource-wise and a platform optimized for the desktop would do the job better. If someone cared enough, they would allocate the necessary resources to minimize this problem (I don't believe solving it is effectively possible because of the complexity and bloat of current web technologies).