That's certainly true, but consider how many tens (hundreds?) of billions of dollars were spent until web development reached the state it is in today. And how

That's certainly true, but consider how many tens (hundreds?) of billions of dollars were spent until web development reached the state it is in today. And how many dead ends had to be explored before we had things like browser dev tools with integrated support for React. Think of all the frameworks that no one uses anymore, the abandoned bundlers, templates, entire languages like CoffeeScript, the list goes on and on. The amount of brainpower invested in the web platform dwarfs what any native toolkit has been given. No wonder it's so good; it would have been a crazy waste of resources otherwise. I'm sure native toolkits would be just as user-friendly, or even better, if they had such lavish resources dedicated to improving them.