Well.. I can see your point.
Both on the mapped keys, and on the instance.

If you can do just about any other heroic, quicker and with less effort on your part...
It would be a lot better to get an easier heroic, for the same two badges each day.

And the keymaps can get to be a bit much.
I'm trying to have similar functions for each team on each keybind.
But that only works to an extent.
And I'm playing four distinct sets of toons...
I hear you on the mapped key part, definitely.