I'll add one to Lisa's list,
Hose Burst, where do hoses tend to let loose? in the middle or at the end near the crimps?
Where are the crimps on a Hide-a-hose? Outside the cuffs, they have to be.
I've probably talked to at least half a dozen cleaners personally that have run the hide-a-hose that way, and Lisa has probably talked to just as many.....none of them are still doing it.
I'm not even sure what Specific reason each chose to abandon the practice, but you kinda have to respect they did it for a reason, cause it was work and money to set up, you have to get someone to crimp the hose after running it through the vac and hide-a-hose cuffs.
Now back to the orig. question.
It can be made "better" but I highly doubt it radiates much less heat.
a heat exchanger is a heat exchanger, steel radiates heat... and the rubber is very thin...only insulates so well.