Why limit myself only to Apple platforms ? Apple is going towards a more closed walled garden all the time, and I don't particularly like that. Also, Os X user

Why limit myself only to Apple platforms ? Apple is going towards a more closed walled garden all the time, and I don't particularly like that. Also, Os X users are a relatively small group compared to Windows users, so if making for example applications for VR, limiting yourself to Mac is a killing move. It's sad though, as I really love the Os X as a development environment.