https://www.makeuseof.com/tag/how-heat-affects-your-computer-and-should-you-be-worried/
Correlation between disc drive failure rates and high temperatures is questionable, however, even leading Google engineers to conclude that “at moderate temperature ranges it is likely that there are other effects which affect failure rates much more strongly than temperatures do.” Effects are greater with older drives, especially those over three years old.
Relative humidity, not higher or more variable temperatures, has a dominant impact on disk failures.
High temperatures are not harmless, but are much less significant than other factors.
Maybe Tablo and drive manufacturer engineers and technicians had a clue with their designs decision and testing.