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This also doesn't mix pseudo-HTML (JSX?) with JS code, so that's cool.

As someone who has sort of lost contact with the front-end world, it's nice to see a coding TL;DR.

Why is it good? JSX is just a declarative syntax for creating DOM elements (usually), and in practice it works really well.

JSX is syntactic sugar for nested function calls, it is JavaScript.

That's why you can do anything (declarative) in them. You can loop, have conditionals, etc. without having to learn a template syntax.