The people who decide platform support for major apps are usually business people, not developers. Businesses want control, which is toxic to the user. So, the only way for a new OS to get enough software support to get off the ground is to take away even more control and allow more abuses by app owners. If an OS has no user base and has pro user anti app owner security design, then very few app owners will provide apps. This problem applies both to android forks and novel systems.