Why the default feed templates only use the first author?

I’m curious about the reasoning to have only the first of the authors in the feed templates’ author section.

The templates can be found here for atom and here for rss.

The part for the author is similar in both:

            {%- if page.authors -%}
              {{ page.authors[0] }}
            {%- elif config.author -%}
              {{ config.author }}
            {%- else -%}
            {%- endif -%}

Why only the first author instead of a comma separated list?

author is a single author entry. We could have several author entries though apparently so that would be better