We strongly believe that the only way to know what something we really look like is to work in the medium in which it will be ultimately be presented in.
Anything less will just be an approximation of the final product.
Anything less will just be an approximation of the final product.
What you're saying would be like saying all movies should be filmed in cinemas… I think using the browser's rendering engine is great, but there's no reason why we necessarily need to create websites in actual browsers.
In fact I think the main weakness of apps like Easel compared to, say, Photoshop, is precisely the fact that they run in the browser and don't feel as fast and responsive as a native desktop app.
Being inside a browser does not equate to slow, and using photoshop as an example pretty much proves that point.