If ONE set of equipment is "done" with medium refine, you can switch to summon contact. First move is very important

Fact of the matter is, you can't get summon contract elsewhere, but you can get medium refine elsewhere, most prominently monthly event. And there IS a finite limit on how many medium refine you could possibly use (once everything is 7 or higher). As such, while in the short term going hard for medium refine is good, in the long run it's just wasteful.

Me, for example, only have 3 pieces below 6 (rest are 8 or above or at 6, holding for wish credit for adv refine, complicated) and I'm ftp. I'm also done with medium thread, so all that is useful in monthly is medium refine, so I am getting a comfortable stock of them.