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Dealerships are owned by rich people and they contribute a lot of money to local politicians. That's why they won't go away even though they are nothing but parasites.

During normal times they add no value and create negative value for everyone. But during a downturn or when a manufacturer makes a dud model dealers can be forced to buy up excess and slowly feed it into the market as well as absorb the losses

Warranty repair is the only advantage.

That's not an advantage: in countries where the manufacturers own the dealerships (i.e., every country not named "USA"), they do warranty repair there too.

There really is no advantage to independently-owned dealerships, except maybe in bribes to local politicians.