‘Brew temperature, at fixed brew strength and extraction, has little impact on the sensory profile of drip brew coffee‘ : Coffee

Well they’re not wrong “brew temp is just another parameter to consider”

Besides that, grind uniformity in my opinion is a bigger culprit.

Water quality is also another culprit.

At the end of the day TDS and EY are just a measurable data, at least a 19% is a 19%, compared to subjective yes or no from a person.