Although i cant give you and confirmation about what the devs decide to do for future updates, i can give you this
If you look at the sets that cannot be obtained through amythest, that will tell you give you an idea on what items to keep
Also personally, when i was a new player and didnt know what to collect, i just grabbed one of everything and then after learning what to keep, i was gonna shorten it down to a few but i kept them for being good for testing ideas without really costing anything