When the concept was first proposed, @mmun suggested the following:

{{my-component (html-attributes aria-labelledby="label-name")}}

I wonder if there is consensus to circle back to that naming? It think html-attributes more clearly solidifies that the helper is intended to apply native HTML attributes to a component. Whereas, just using attributes could potentially confuse new adopters of Ember. I'm anticipating new adopters might try something like:

{{my-component (attributes aria-labelledby="label-name"  my-special-thing="my special value")}}

{{! intending to define a property, which should have been written as follows: }}

{{my-component (html-attributes aria-labelledby="label-name") mySpecialThing="my special value"}}

I know it seems odd, but I've seen other frameworks that tend to conflate properties and attributes.