I don't understand what the calculator has to offer the big miners.  Usually big miners have the most accurate profit data, and their data takes into account equipment breakdowns, power outages, and all other nuances that no calculator uses yet.
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You're right that a few large operations managed to install monitoring system (at least they got that right finally). The calculator, even at this beta stage, can be useful in specific cases like calculating downtime/opportunity loss/missed. And I already talked to some users who used it to get precise, verifiable numbers in such a case.

Also not just mining farms—it’s a profitability estimator for cases like opportunity loss from curtailed wind energy for example: in 2023, Northern Ireland had to curtail 539 GWh of wind energy. To put that into perspective you can translate it using the calculator into 60MW of unutilised capacity or 534 BTC mined on s9... on that point have an idea to have a real-time conversion of curtailment data (if i find a grid which is streaming such data)