When S&W puts that into the "Purpose" section of a gun along with say, "Self Defense", what, exactly, does "State Compliance" refer to? 

If a particular revolver model hasn't passed CA drop tests, it is banned in CA from import.I always figured that it meant it was legal in states like Massachusetts, California, Jersey etc. In other words, it doesn't have a magazine holding more than 10 rounds. It seems redundant to refer to revolvers as "State Compliant" because AFAIK none of the aforementioned states have bans on wheelguns. Do they?
If a particular revolver model hasn't passed CA drop tests, it is banned in CA from import.