It's not quite that simple. Many states have also adopted the low VOC rules modeled after California:
"Some of the states banded together in groups to improve their air quality. The largest association of states, the Ozone Transport Commission (OTC), includes Connecticut, Delaware, the District of Columbia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont and Virginia. In the midwest, the Lake Michigan Air Directors Consortium (LADCO) includes Illinois, Indiana, Michigan, Wisconsin and Ohio. The goal of both these affiliations is to improve the local air quality by reducing VOCs and other air pollutants.
To accomplish that, they have mostly agreed to adopt the comprehensive rules created by the South Coast Air Quality Management District (SCAQMD) in Southern California. The 17 million people who live there have created some of the worst smog in the country. Both the SCAQMD and the California Air Resources Board’s (CARB) rules are much more restrictive than the EPA’s national rule. "
Interesting, reading the trade publications about low VOC paints there is a lot of discussion about the pros and cons mostly about ease of application, equipment and cost but no mention of "soft paint" so I'm thinking that the "soft paint" syndrome may be confined to TMC.
Refinish: The Green Scene – Low-VOC Market
Waterborne/Low-VOC: Where Are We Today?
PPG: Environmental, productivity gains to spur greater waterborne paint adoption