That's certainly true, and in many cases you don't need it. You can definitely just put the <h1> (or <h2>, ...) tag on its own, and AFAIK that works just as well for screen readers, SEO, etc. But the advantage of a <header> is being able to group other things like inline icons, section anchor 🔗links, etc., and I find myself going back and adding those later often enough that I have just made a habit of using a <header> wrapper almost all the time. But with that said, it's a very YMMV situation, so feel free to skip the <header> if you feel confident you don't need more than the <h1>, there's nothing wrong with that semantically 😊
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