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It is optional for a client to support server push.

It I understand the RFC correctly a client can announce server push support via the SETTINGS_ENABLE_PUSH setting. So if a client chooses not to announce push support it is still standard compliant.

Two words: Market domination.

Please, they're the one that added this in SPDY to begin with. They would do that even if they were a minority player because the reason they actually remove it is that it provides no gain for the work required.

Well, either it's a standard or not.

And if the most powerful browser vendor decides to drop support for standardized features that is a strong "political" signal against the standard and it absolutely has a different meaning...

I don't understand. What makes you think Google or any other company out there HAS to support the entirety of a (non certification dependant) standard if they estimate that they could drop a part of it at no loss / at a gain ?

Is your company properly supporting HEAD on its website ? Probably not (treat it as GET), because it's easier and no real loss is incurred. Same here.

Almost as if there's no standard, and everything's really just running on a proprietary Google protocol...