That doesn't mean the market can't get still more efficient, but having a nice presentation of public data is definitely worth appreciating.
I'd also add that real estate agents can provide substantial value. Many don't, of course. But buying a house is an enormously complicated transaction, with a lot of legal, financial, and material complexity. Buying a business is even more tricky. To me it's similar to having a lawyer: there are good ones and bad ones, and sometimes you might not need one at all. But they're not pure waste.