Thank you Chris.
I understand what you mean, but as blog's title is an H1 everywhere, also in single pages, having H1 in post's titles doesn't make much sense, does it?
Suppose I have this structure on my frontpage:
'<h1>Blog's title</h1>
<h2>Post 001</h2>
<p>Blah, blah, blah, blah</p>
<h3>Something</h3>
<p>Blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah.</p>
<h3>Again something</h3>
<p>Blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah.</p>
<--more-->'
On single page I would have:
'<h1>Blog's title</h1>
<h1>Post 001</h1>
<p>Blah, blah, blah, blah</p>
<h3>Something</h3>
<p>Blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah.</p>
<h3>Again something</h3>
<p>Blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah.</p>
<--more--><p>Blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah.</p><p>Blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah.</p>'
As you see, document's struture is broken as I have 2 consecutive <h1> and a missing <h2>.
I know that this is not an actual issue, but I like to keep my page's structures consistent, not to mention that, on my specific case, posts' titles would have the same style on both frontpage and single page.