I don’t get it. You don’t really need to understand how React works, you just need it to work. If you’re building a React app you’re probably just building some simple CRUD like thing. What are you going to abandon React for? Some other black box?
> Remember that React is supposed to take care of the “how” so that we can focus on the “what” of our apps. This mantra though, assumes that we can predict the “how”-part correctly.
Their claim is that it's becoming increasingly difficult to predict how React is supposed to work in different scenarios.
"Black box" means you don't know what happens INSIDE the box. A very succesful software abstraction might be a black box, this isn't generally considered a negative in software. A good "black box" is completely predictable from it's interface, even though you have no idea what's actually going on inside of it.
To me, "accessing disk IO" is a "black box", I have only a vague idea what happens inside the black box when I ask to read or write bytes; and I don't need to, because it works reliably and my very simple mental model of how it works serves me. (If I was doing realtime or high performance or something, I might need to go inside the 'black box', making it no longer a 'black box' that you can't see inside, but I am not and have not).
Wikipedia: "In science, computing, and engineering, a black box is a device, system or object which can be viewed in terms of its inputs and outputs (or transfer characteristics), without any knowledge of its internal workings."
But that's not actually what OP is talking about.
The author is not actually complaining that it's a "black box", he's complaining that the inputs and outputs of black box are too hard to understand, that the mental model of what the black box does is too complex, that it's no longer predictable what it does.
This article might get upvotes because people agree with that basic conclusion, it matches their experience. But it's a pretty poorly written article. It has no examples or evidence, and it's central point is poorly expressed using the wrong terminology or metaphor.
Simple CRUD-like thing? Why would you reach for a front-end framework such as React to build it in the first place? Ideally, React should be used to solve sufficiently complex problems.