Oh boy, an app! I'm looking forward to yet another 20-40mb binary which offers a subset of the features of the 2.3mb website.
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In all seriousness it would be significantly easier for all involved to make the existing website better work offline (without any of that nasty synchronising state bullshit) through service worker caching. Chrome, Samsung and Opera are all pushing forward in this direction.
Much of that 2.3mb image is uncompressed, or suboptimally compressed images, with the remainder of the loadtime being callouts to analytics and social sharing scripts - All of which is optimisable to allow the site to be cut down to the ~150kb range. Starting to look a whole lot better space-wise than that 20mb app, huh?