I agree, but I think it depends on the market.

In a hot seller's market, then indeed it can be super easy to sell a home, so real estate agents will make more money for less work doing that. In that same market, working with buyers won't be as easy at all because a typical buyer might have to make offers a dozen or more times before successfully closing, and some may never end up being able to buy.

But, the opposite can exist. In a slow market with a lot of inventory and low demand, it can be much easier to be a buyer's agent since the buyers have lots to choose from and all of the leverage.