Why is a single serial port managed with a single interrupt-driven I/O but a front-end processor is managed using a polling I/O, such as a terminal concentrator?

Why is a single serial port managed with a single interrupt-driven I/O

1.	Why is a single serial port managed with a single interrupt-driven I/O but a front-end processor is managed using a polling I/O, such as a terminal concentrator?
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