Not completely useless if it mitigates the heat effectively and is quasi-silent.
All heat mitigation solutions cost money. But without cost specs and decibel facts, not sure how it stacks up against other cooling methods.
Its an industrial miner, the fans mitigate the heat just fine, sound should not even enter the equation.
You dont buy a Tesla and take it to an off road park.
You shouldnt buy industrial equipment and then run it in a residential environment.