If cooling of the VLSD were the only function of the diff fluid then, yeah, it wouldn't make much sense to change it often. Since the diff fluid's main function is to lube the gears and all fluids break down (much faster at higher temps), it's a good idea to change it out every now and then. If you are getting the VLSD/diff that hot on a regular basis, it would be a good idea to change the diff fluid quite often.
A cooler might be a good idea.
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