What's wrong is simply the developer experience. It's a pain in the ass to write or maintain more complex apps with barebones HTML and shimmed in Javascript. That's how we used to have to do it. It worked but it was bug prone and hard to reason about. The abstractions are there for our sake, not the users. And they help tremendously if you learn to use them. But you don't have to. Go wild coding plain HTML and vanilla JS if that meets your needs and preferences.
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What's wrong is simply the developer experience. It's a pain in the ass to write or maintain more complex apps with barebones HTML and shimmed in Javascript. That's how we used to have to do it. It worked but it was bug prone and hard to reason about. The abstractions are there for our sake, not the users. And they help tremendously if you learn to use them. But you don't have to. Go wild coding plain HTML and vanilla JS if that meets your needs and preferences.