Are you speaking from experience in the real estate industry?
I'll agree that RE agents ("Realtor" is a trademarked term) are essentially unnecessary for the happy path when a property sale goes smoothly. In that case, they are overpaid secretaries.
But the reason RE agents are their own profession is because when a sale starts to wander off the happy path, there can suddenly be a LOT to know, discuss, and do. A good RE agent will be honest with you if the asking price is ridiculous in either direction. They know all the little local details and laws that are easy for a layperson to miss. They'll help you deal with a difficult buyer/seller. They know where the flood plains are. They know about zoning. They know who to call when the weirdest shit pops up. There are few other areas in life where ignoring (or not seeing) non-obvious red flags can ruin a person or family so completely.
I have had bad RE agents that were uncooperative paper-pushers who kept dropping the ball, and I have had good RE agents that were worth every single penny they earned.
If you want to be mad at something, I suggest looking into the National Association of Realtors. It is essentially the union that all RE agents are a part of, whether they want to be or not. NAR essentially owns the bulk of property listings in the US and heavily gatekeep access to it.