Comment by torginus

> - does a React/frotnend engineer need to know everything about react internals to be good at their job?

Yes? Well, not everything (which I define as being able to implement React from scratch). But if you want to do good work, and be able to fix those pesky bugs which result from the arcane behavior of the framework itself, then you better know your stuff.

Besides, in practice very few people understand the most basic stuff about React. Just recently I had to explain to a veteran frontend dev what list virtualization was and why it's not a good idea to display a list of 100k items directly.