Very true but this question was focusing more on the technical side of things. For instance, do these cross-platform frameworks limit what I can do on each platform in the same way that you could always tell a Java application because the UI wasn't Windows native - that type of thing. That's why I didn't post in the business forum
Or I could ask another way, what are the downsides of these tools that would mean I wouldn't use them?
iOS is still by some distance the dominant target/market for what I want to do but for all I know, these frameworks are a good idea even for iOS-only projects in terms of making development faster and not requiring lots of iOS-specific expertise.