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This question may not look as an important one and in fact it is just out of curiosity.

To the point:
Ethernet ports usually have two light indicators of activity (blinking leds). Yes, I know that they indeed indicate activity, but why do we need that for Ethernet ports while we don't for other interfaces? Is there any official explanation for that or is it just a matter of tradition nobody cares about? Or else?

Looking forward to see your knowledge or ideas on the topic.

^{This question may not look as an important one and in fact it is just out of curiosity.}

But to the point:

Is Ethernet port blinking really useful?

Ethernet ports usually have two light indicators of activity (blinking leds). Yes, I know that they indeed indicate activity, but why do we need that for Ethernet ports while we don't for other interfaces? Is there any official explanation for that or is it just a matter of tradition nobody cares about? Or else?

Looking forward to see your knowledge or ideas on the topic.