[s1artibartfast]

If it is cheaper to store at 1400 than 500, then that is an argument for doing so. Higher temperature is not a justification in its own right, absent economic benefit. It is also the case that conduction losses are proportional to heat, and it brings many other challenges as well.

[Retric]

Chemical processes don’t occur at any temperature. So the ideal storage temperature depends on the goal temperature and a bunch of other factors.

The argument for storing at 1500C could be 500C is useless not just worse economically.