[PaulHoule]

My main complaint is that React doesn't handle highly dynamic situations. Think of how tools like photoshop or programming IDEs have tons of views and windows and property sheets and stuff and manage to update the right parts of the UI when things change. React on the other hand makes a structural link between the component tree and how state propagates.

Specifically I wrote a bunch of React components for making little biosignals applications that can (say) show two people's heartrate from bluetooth LE and show my breathing based on a strap i am wearing and another person's breathing based on a $20 radar from China.

I can pretty easily snap together the components and the system that feeds the state to the components by writing code. It works great, it's not that hard to do, it looks great.

But: I really wish I could make something where I could drag and drop display and data acquisition and processing components like LabView. Actually I know a lot about how to do the dynamic processing (Hint: read the Dragon book, not On Lisp) but React doesn't support dynamically assembled components... But I know Javascript systems can because I was writing them 2005-2010 back when browsers didn't have async and all the great affordances they offer now.