Does Rikulo UI make you commit to either web or native? For instance, let's say that I wanted to make an app but I'm not sure if I want it to be native or web. Or, better yet, let's say I make a mobile app in Rikulo UI and want to turn it into a web app: how difficult is it?
I have used Cordova and your question that is certainly something to always be considering when adding native features in it. However if you use proper abstraction, something Dart makes a lot easier than JS, its not a huge issue. So assuming this framework is like Cordova I imagine the answer to your question is; the framework will not hinder you generating a webapp, its about how you structure your code.