Pjw, West Coast is not quite in the normal lineage of modern jazz, it was developed in LA utilizing elements of modern jazz. The music developed around the California culture, which was cool and laid back.
For me, it is an alternative that requires a different "mind set". Just before you posted I was writing a post for Rok to get his evaluation of "West Coast". Now that this is included, we'll see what he has to say.
For me personally, I'm doing some serious shopping. My opinion is not to compare it to "East Coast", but to enjoy it for what it is. Rather than compare a Kiwi fruit to an apple, just enjoy whatever it is you're eating at the time.
Now that we have "You tube" I can be very selective.