I think this slightly understates the "business development" problems with developing a new OS, and a mobile OS in particular. It turns out that there are certain apps that, if they are not available on your platform, are immediate deal breakers for huge numbers of consumers (to the extent that they will ask for them by name in stores and return devices that won't run them). Often these apps lack web frontends (for non-technical reasons).

Obviously there are technical workarounds that you can attempt but consumers are wary of "knock off" products. So there is a vicious cycle in which people won't produce the content that you need to get users until you already have users. Possibly one can break this by supporting Android apps, but you would have to make the experience as good as an actual android device, which seems both demanding and limiting (because of cross-app interactions via e.g. intents).