I'd be asking why is a FORM an ASIDE (it probably isn't -- not that anyone uses ASIDE for asides... not that most people even know what an aside is, and no it does not mean a sidebar of unrelated content), why does it need an ARIA role in the first place? where's your FIELDSET? What the blue blazes makes this a term and definition...
In other words the exact same nonsense as I've come to expect from everything built with the idiotic train wreck known as HTML 5. Nothing like using TWICE as much markup as necessary and pissing on accessibility while at it.
You don't have an "aside" you have a form... you don't have "facets" you have a FIELDSET. You don't have a DT and DD, you have a LEGEND for the FIELDSET and the INPUT/LABEL inside said FIELDSET... and then the unordered list for christmas only knows what... or the roles that are redundant to the element's TYPE (serious whiskey tango foxtrot).
Perfect example of everything WRONG with this HTML 5 BS and bloated ARIA nonsense... and a stellar example of why I keep telling EVERYONE to forget that nonsense and stick with what actually WORKS in the here and now -- 4 Strict and/or XHTML 1.0 Strict.
<legend>Facet Group 1</legend>
<label for="checkbox1">Some Label</label>
<input type="checkbox" id="checkbox1" name="checkbox1" />
<label for="checkbox21">Some Label</label>
<input type="checkbox" id="checkbox2" name="checkbox2" />
HTML5 idiocy -- or more specifically the above being how to take that idiocy and shove it where it belongs. FIELDSET, LEGEND, INPUT, LABEL -- PERFECTLY GOOD functioning working tags without any of that extra bloated ARIA or HTML 5 BS that does absolutely NOTHING useful or better.
I can't believe people are buying this snake oil...
'Twas Pirelli's Miracle Elixir,
That's what did the trick sir,
True, sir, true,
Was it quick, sir? Did it in a tick, sir?
Just like an elixir ought to do.