Why does GFM to markdown not convert HTML?

[Dominik Wujastyk <wujastyk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Using  
pandoc -v
pandoc 2.14.2
Compiled with pandoc-types 1.22, texmath 0.12.3.1, skylighting 0.11,
citeproc 0.5, ipynb 0.1.0.1

Gfm input example:

# NAK 1-1079

<h2>
  Chapter-wise concordance of folios
</h2> 
<h3> 
  Prepared by Dominik Wujastyk (DW) and Andrey Klebanov (AK) 
</h3>

Note that this MS (a single physical object kept at the __NAK__ under the 
accession number __1-1079__) 
was microfilmed twice, as **A 45-5 (on 16.10.1970)** and **A 1267-11 (on 
16.11.1987)**. Digital copies 
of both microfilms are available to us.

```

Command:  

pandoc -f gfm -t commonmark -o outfile.md infile.gfm

Commonmark output:

# NAK 1-1079

<h2>
  Chapter-wise concordance of folios
</h2> 
<h3> 
  Prepared by Dominik Wujastyk (DW) and Andrey Klebanov (AK) 
</h3>

Note that this MS (a single physical object kept at the **NAK** under
the accession number **1-1079**) was microfilmed twice, as **A 45-5 (on
16.10.1970)** and **A 1267-11 (on 16.11.1987)**. Digital copies of both
microfilms are available to us.


I was expecting that this command would turn the HTML codes in the gfm file 
into commonmark Markdown.  But it didn't.  Am I doing something silly?  
Have I failed to understand what commonmark is?  The HTML-coded text does 
render in Github and editors like Typora.  So it seems wrong to treat them 
as raw blocks.

Furthermore, a markdown-encoded table in the gfm document is converted to 
an HTML-encoded one.  Why?  This seems counterintuitive to me. 

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