Actually I think of it as conservative rather than extreme. Rather than pushing performance to or beyond design limits I'm thinking of putting less pressure on components. HDD coolers can't hurt. Each drive takes one bay with or without the coolers. They don't take any power. The cost is negligible compared to the cost of time to replace a drive or restore data from backup and even less significant compared to the value of the data. So they can't hurt. Do they really help? Why risk it?
Of course we see endless examples in many threads of extremes of effort and expense that have absolutely nothing to do with performance or reliability.





