I agree that recruiters help reduce noise, but as per Sturgeon's law 90% of applications for jobs are noise. AI can and already do (ATS systems) screen out unqualified candid ants. The application process would be more streamlined without recruiters. AI should and will replace recruiters in the future.
The job I currently have, I applied for on the company website. And they flat out rejected me. Then a recruiter contacted me directly and offered me the same position at more money. I don't think people can wrap their head around the ineptitude HR departments are capable of when developing these "automated" solutions.
Especially given that a person-to-person phone call is cheap, fast, and humanizes all involved parties.