For me
You could win the resets only for classes that earn upgrades/nerfs. Take for example have a build with Corsair C2 and he gets a nerf, I am entitled to 2 restart circle if I have only one gain 1… and only to change Corsair slot and I have to up the class again.
Imagine you up at rank 7 take one class and its get nerf or another update you dont like.
the rest you can imagine how good or bad is your build, need only be patient and learn about, have a lot of resources for that.
Sorry my english, is not my native language