Riot: "Autofill and fill taking priority over other people's primary roles isn't a problem."
In case you missed it, that's what this patch note means:
http://i.imgur.com/HTDoAZH.png/img
Autofill and fill taking other people's roles (instead of actually filling a role that's needed) is a thing that happens. And I guess Riot doesn't care and refuses to acknowledge it.