When you want to have realy long reach, then use a Tele-Lens.
But a tele-lens (next to worse iq than a macro) needs way higher shutter speed as you're so far away from the subject, and you completely lose af precision when shooting with a thin dof. I have some nice "environmental" butterfly shots with my 70-300L on a 60d, but you never, ever get near that kind of magnification even on mfd.
Agreed - this shot was taken with the aperture wide open and the light source was troublesome in relation to the position of the lens.
The nice thing about macro shooting is that you really learn to develop a sense for details - you don't see "oh, a butterfly!" anymore but know the whole animal front to back. And the behavior, if you try to crawl up on it.
The problem with shooting live animals (and we don't kill 'em for focus stacking, do we?) is that if you want to have a lot in focus this leaves you with exactly one position - right angle to the lens. With everything else, the dof is too thin to get even one eye into focus, let alone the whole head so I feel this always has a "out of focus" look to it. Ymmv.