I'm very much in support of this. It's something that should have been added a long time ago.

For me this was by far the most surprising answer we got from all the PAX East stuff, given how reticent they've been to do it the past:

1:48:57
Q: Are there any plans to add a feature where any item you obtain once is recorded in some sort of a directory, and even if you get rid of that equipment, you can use a glamour prism on anything in the directory? With a feature like this, users could create a lot more room in their inventories.

A: Yoshida: If that were possible, it would be easier to just increase inventory space. Every player would have to acquire item obtainment information data, which would be very difficult.
Nice to see that they're finally starting to come around on it.