As per this post:
I completely agree. Sometimes I don't have time, or am just not in the mood to do a Heroic. And apart from the time wasted, and takes you out of the story when you say "You can rely on me", realise it's H4 and then have to abandon it.
This could be fixed so easily by making those mission givers Icon a different colour, or putting a description in their mouse over text.
Anyway, thanks for listening.