1: Is heavy breathing and breath supposed to be kept separate or not? Breath wiki currently has the line "Also used to emphasize the "steaminess" of an erotic scene." which I thought was what heavy breathing was partly for, should there be an implication or not?

2: We currently have 3 kinda similar tags for the cartoon-y version of breath: =3, visible air(?) and sigh. Should all these tags be kept and/or should some of them implicate another (visible air being the obvious choice for a catch-all tag)?

=3 is for a common cartoony representation of breath which should not be given the breath tag. According to the wiki, sigh would then be either of these, but with a sighing sound effect as well.

Visible air seems to include =3 like things, breath and steam, plus wind-based magic and, in a few pictures, fog or condensation trails. Do we really want a catch-all for all these things? If the answer is "yes" then all of them should imply it.

I don't know what the purpose of heavy breathing is. I note that panting is aliased to it but would associate that with something else entirely.

I'm the one who added that line in the wiki BTW, but feel free to remove it if it doesn't fit the tag.