Adopting React.js seems risky for long-term projects

The author posted this in both /r/javascript [0] and /r/reactjs [1] on Reddit, and got a number of detailed replies, including some extended answers from myself. The doc comments about `shouldComponentUpdate` _possibly_ changing somewhere down the road could use a bit of clarification, but overall he seems very mistaken in how React's re-rendering process and reconciliation algorithm actually behave. See my specific replies to him at [2] for more details.

[0] https://www.reddit.com/r/javascript/comments/6hpmdk/adopting...

[1] https://www.reddit.com/r/reactjs/comments/6hpgzx/adopting_re...

[2] https://www.reddit.com/r/javascript/comments/6hpmdk/adopting...