Leg extensions seem to have a bad rep these days but are they

Is there a reason I see many people do very light weight on machines like leg extensions? Is it beneficial to do max weight you can do with proper form or is

Why is the raising leg exercise called the fire hydrant? - Quora

Leg extensions seem to have a bad rep these days but are they actually any good for building upper leg muscles? - Quora

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What are the benefits of keeping your heels down during a leg curl exercise? - Quora

How to do leg extensions - Quora

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What are the benefits of keeping your heels down during a leg curl exercise? - Quora

Which is better leg extensions or leg press? - Quora

What are the benefits of keeping your heels down during a leg curl exercise? - Quora