IMO there are plenty of extroverts here.
But this is also “safe space” where the strong introverts can admit that in public. So you see them standing up and speaking out like they’re at a 12-step meeting: “I’m [whoever] and I’m a total introvert.”
Why do they include the word “coast”? Why not Eastern and Western? To my mind, “coast” is absolutely unnecessary. Instead, adds some ambiguity - suggests some meaning that is arguably incorrect. or unclear.
I suspect “West Coast” is an artifact of their origins in California. Of course, when they were solely based in California and the SW, they didn’t have to designate their HQ as coastal - or even western. Once they crossed the Mississippi and perceived a need to bifurcate operations, they were free to choose whatever descriptors they wanted. I wonder if retaining the coasts suggests a plan to eventually add additional zones, such as Midwest?