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The main reason for not using feedback control system is that time lag may cause a process deviation near the beginning of a process not to be recognized until the process output. It can result in substantial deviation throughout the entire process, causing an error to continue without adjustment.

Since feedback control systems usually take input from one sensor. there may be better and more direct ways to control a system using multiple sensors.

Operator intervention is usually required when the system is not able to maintain stable closed-loop control.

Feedback control systems do not take predictive control actions for effects of known disturbances.

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