Coil Over vs Torsion Bar
I would agree with this statement, however I believe it has morphed into something much larger. The cause of this "evolution" can be debated but the fact is that it has and I think the main take away is that both systems (if done correctly) can perform equally well.
Its like many things in life, the old remains viable but there is always something new and exciting out there which many people will lean towards if for no other reason than it is new. Look at phones and computers, sure new ones work exceptionally well but the old ones will in most case still get it done.