Along the Spanish coast there are many coastal names from; Costa Dorada, Costa Blanca, Costa del Sol, etc, but I agree that instead of calling Sitges within the Garraf coast, the government is going to start calling the local coast ‘Costa Barcelona‘. The reason the government did this is that more people know Barcelona, than even possibly Catalonia, thus, I think it is wise to call the coast near to Barcelona; Costa Barcelona, so that tourists can relate to where in fact are places like Sitges.
Over the 100km stretch of coastline from Maresme (north of Barcelona, along the coast to Vilanova I La Geltru, there are national parks, never-ending beaches, and loads to do from renting a yacht, or maybe going on a wine tour in El Penedes wine region.
Either way it’s very convenient to stay within the Costa Barcelona area because it is always within 30-45mins from Barcelona, which is great for taking advantage of all the sights and sounds of BCN.
Hopefully the Costa Barcelona name will catch on worldwide because as it stands, Sitges still has a bit to do on the world stage, yes it’s only a small village, but it does pack a big punch!