Whatever you elect to call it, the child is still illegitimate, and some would say so is the child born by artificial insemination. When breeding animals by this means, great care is taken to record the semen donor, but not so for humans. One reason we record an animal semen donor, is to track genetic defects and hereditary disease should they occur.
From a genealogist's view, recording only the maternal side is at best only half the story, no better than those that only record the supposed paternal line.
I'm not sure how we can guarantee an accurate account, and if we cannot, then how does that reflect upon any pedigree ?