But with tons of alternative frameworks available, all inspired by React (including all the varied ways of structuring a React application), the problem that bugs me is that of the availability of libraries/components, like drag-and-drop things, comboboxes and so on.
Actually I liked it so much I'd started writing a non-trivial app to use as a tutorial (https://github.com/spapas/hyperapp-tutorial) but because of the breaking API changes I wasn't able to finish it. Hopefully, now that the API has stabilized I will be able to post it!