As I think is probably the implication of all that you go on to say, I've not convinced that it would have any appreciable beneficial effects (and, as you point out, it could actually have detrimental ones), even in the relatively short-term. The 'compensatory' effect of SMPSUs and thermostatic etc. control would be essentially immediate.
I suspect it's an idea originating from the bean counters, rather than qualified, experienced engineering staff.