Possibly in terms of meeting agents and managers. However, with the rise of YouTube and other social media, you could broadcast from the middle of nowhere and still get discovered.
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Yes, recording studios, record label, live music clubs, movies, its more common there, so like Nashville it can be your job there. A lot of competition though.
It would depend on what your definition of “gain traction” is. If you want to sign with a major label, then you probably need to be where the labels are. If you’re looking for paying gigs as a musician, it might actually be more difficult in LA because there’s so much competition.
As a songwriter, it’s very difficult to land a publishing deal. Still, there are networking oppotunities available that you won’t find outside of the major music centers.