m4 discard comments?

What if m4 let the user discard comments? I would find it useful.

I know about m4_dnl and m4_divert(-1) as alternatives. But to me, these 
lack the visual indication of a comment (they blend in with surrounding 
text), and feel kludgy (they are very different from # or // or /* */).

Any reason not to let the user discard comments?

Thanks,
Daniel