Almost all games have an upgrade system in them, so what would be the point of lumping them together? ''Upgrade'' is such a vague and dubious term. Though of course, AG 3 will have a better tagging and sorting system, so nothing is finalised yet. Apart from no changes rolling out in this version of AG.
I agree with Nicodemus on this. And there are so many genres that might have an upgrade thing in some of the games. I t would be no use to anyone. Upgrade could also mean more than one thing in a way. AG3 however, does have a more refined games searching system that I have tried out (check out the beta) That clumps games together that are similar in a way. So try that out, I use the AG3 beta if I want to find a sub-genre (a genre within a bigger genre). Hopefully that will help.
