>If it falls back gracefully, why not?

It doesn't. Content doesn't load here on a FF with js disabled (not that i do this normally, disable JS, just tested it because of your comment).

I think it kind of matters in this case. The "mail has to be repaired" is such an overused term, and seldom the people claiming that even try to give reasons for this ruling. Mail is an asynchronic system for letting people send messages (with attachments) and it works really well. If someone fails to see that, claiming something is broken which most probably isn't and is doing that from a technically broken site, it weakens his point even further.

So mentioning the observation isn't totally out of place.