You are putting home miners versus industrial miners all over and over again, but my disapproval for Bitmain removing features from miners has nothing to do with that.
I have no idea why you are defending their decision removing features.
Obviously people want the ability back to underclock. I've been mining for nearly 6 years now. It is extremely useful in so many scenarios. It makes 0 sense and is incredibly short sighted to defend removal of the feature.
Thanks for supporting my view!

It is indeed useful, both in home and industrial level mining.
And manual fan control is also one thing nice to have.
I have non-autotune S9s models and autotune R4 models, so I have pretty good amount of experience about both systems.