Look over quick starts of React and Angular, for example. One is a well structured application, the other is a spaghetti script, all held by magic and conventions.
If you recall the (in)famous "PHP: a fractal of bad design", React basically ticks every box in this rant and then some. It's not surprise knowing it's origins, but still.
The reasons React has got traction are the same reasons PHP got traction or web frontend dev in general and have nothing to do with being well designed: it tries to "render" something visible, which makes early adoption much more interactive (hey, I've changed one line and now instead of 15 errors I have 25 different ones and the text moved!), however at the cost of any shot at long term maintainability. Before someone comes and tells me React is just a tool and you can make good products with any tools I encourage you to look at all the headliner star projects by Meta: if they cannot make websites in React at least somewhat functional and stable, no one can. Google headliners built with Angular, for all their warts, are at least for the most part functional.
