MMario, you doubtless know that Mudcat uses the ABC system for melodies, thus "never gets mentioned", even without exclamation marks, is not accurate. Not all posters want to learn the system, and many may think that the tune is easy to learn by ear from recordings, or "known anyway". If you want to encourage more ABC tune postings, I second that.

ABC allows for chord symbols, which will not only be printed by notation software, but also recognized and (somehow) interpreted by playback software. —

Indeed, McGrath, harmonizing melodies (traditional or coming without original accompaniment) is a matter of taste to some extent, and always takes a lot of training and knowledge, whether or not including verbal theory. In such cases, asking experts and discussing their preferences is a good idea.

However, many requests at Mudcat specify "... as performed by ...". Obviously the asker has that recording and wants to reproduce it. This is problematic for several reasons, one of them mentioned in the OP. Worse still is the superstitious hope to capture the secrets of an accompaniment by the chord symbols alone. Any time we fulfill such a request, we must emphasize that there is a lot more to it.

Still, if someone credibly explains her or his wish, says "thank you", and is happy with the chords, why should we object. One performer mentioned my nickname on YouTube ...