I think everything you mentioned in your list of clans retcons really is not that big a deal and maybe you should just chill.
Like you mention that Chronicle is 90% WoD information. Sure, but they still chose to illustrate Blackhand with his movie version and not the WoD version. Shattered Hands have white skins but are we even sure it's their natural skin ? It's not even among the playable customization.
And do your descriptions of the orcish clans from War1/2 apply to their precorruption or postcorruption cultures ? Because the wod culture is supposedly precorruption. And coming back to the Shadowmoon, it makes sense for the orcs to start burning their dead once they became a nomadic band of bloodthirsty invaders, but if the Shadowmoon clan had been sedentary before that, then the burial grounds also make sense.
As for the mostly fungal Draenor, yeah I too remember the mushroom forest of Hellfire Peninsula. I also know how Blizzard likes zones to have a wide variety of environments with proper identity. Also, perhaps having the orc world full of mushrooms would have made them dangerously close to the orcs of another popular setting ?
This is just classic fantasy nitpicking, we all know the only reason for that is visual identity and conforming to an archetype. Or else everyone would have gnome and goblin weaponry.