The problem with crafted gear being equal to NM and event gear is that you then don't feel compelled to do the events. The content itself is accessible, but the drop rates are a pain.
That's why I explicitly aimed to make the new evolith system something more in terms of gear to hold you over while you aim for that drop (which gear a tier or two below NM, VW, Abyssea would do). Additionally, it gives those of us who are less than thrilled about certain pieces of gear (I wasn't kidding, I do hate the Zelus Tiara) alternatives, which is never a bad thing.
Lastly, it'll put artwork that no one ever sees to use. I never see Aketons, or coehardies, or even the lv70-ish JSE anymore; there's a good chance we could start seeing more of those around if we could somehow repurpose the gear, which is what my suggestion would allow. It's just sad to see so many gear designs gone to waste in this game because of crappy stats (or no stats at all!). Not to mention, it gives Synergy some use, gives Alchemy some use, and shouldn't get in the way of "balance". I'm still iffy on weapons, but that's more for the devs to decide.