I'm going to be blunt: you claimed "OpenJDK [is] not a realistic choice in MOST production environments" (emphasis mine).
I asked for evidence for this bold claim, since many production environments I know are using OpenJDK successfully, under heavy loads and without crashing. So... evidence of your claim?
Lol, like that was a choice Google made freely, rather than something they were forced to do.
OpenJDK might be OK in many circumstances (as I said, requirements vary) but you might want to avoid that particular case study.