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For now browsers won’t remove support for hgroup but it’s likely that they will do so in the future.
Its only stated reason for being in HTML is to support a non essential case in an algorithm that is not implemented in any browser
src: [lists.w3.org...]
<h1>Heading</h1>
<h2>Subheading</h2>
<p></p>
<h2>Subheading</h2> <-- also "subheading", not simply "some other header"
<p></p>
<h1>Name</h1>
<h2>Tagline</h2>
<h1>Name <span>Tagline</span></h1>
If you want a tagline or similar to your header, and are using h2 because it's visually different, then you are using it wrong. h1 and h2 are semantically different.