So, this bothers me a few different ways:
1) I, as an in the know competitive player, didn't even hear of this until now.
2) it doesn't actually look all that balanced, sorry, Matt.
3)GW has gone from a "we re not a game company, we're a model company", to a "we pump out rules for money" company.
4) this has destroyed any expectation a player may have of actually knowing all the rules available in a game
I will note, Matt, that the Tau expansions is a dataslate, meant to apoc only. I feel like this should be seen in a similar light. It certainly doesn't feel like a "real" expansion. No, I have no idea what easy marker there is for a codex to be "official" anymore. The Supplements (like clan raukaan), I think should count, codex inquisition I am less sure about. Little $4 one a day thingies really shouldn't.