I hadn't heard that as something the devs put forward, though I do remember plenty of people suggesting it in beta. The one problem I found with that is that (currently) materia is very specific, as in you can only put it on crafted gear. There's also the rarity of it, people suggested something like Choral Shirt could be turned into Enhances Ballads materia, that being a 100% chance seems reasonable (instead of what we currently have with gear converting into almost random materia) but there is still one issue; how do you obtain more of it? Once you've melded it it's stuck to that gear and eventually as the level cap rises, you're going to want it on a new piece of gear, I guess taking Bard's Shirt and converting that could work, since you can reasonably obtain that again... I wouldn't want to reobtain Mythology AF though....
