Every tool deploys its own agent.
EDR platforms deploys a sensor. open-source SIEM agents deploys an agent. vulnerability scanner agents deploys an agent. enterprise SIEM platforms deploys a forwarder. A typical enterprise endpoint runs four to seven separate agents, each consuming memory, each requiring updates, each creating a management surface.
For sovereign security operations, the problem is worse — each agent ships data to a different cloud service you do not control. The endpoint becomes a telemetry broadcast tower for third-party infrastructure.