What's the real skinny on HOST

This is a general question for the CCing masses:

I've done a number of jobs where I've come in behind a HOST job and wondered why the "carpet fresh" approach is so loved - Are HOST just good at selling the sizzle?

The issue is soil suspension - You have 4 levers to pull (this according to the IICRC & CRI):

chemical action
heat
agitation
time

how does HOST work? can it remove a film? FOG (Fat,Oil,Grease) is a predominant film we all must clean so all four actions are needed to effectively remove it. Finally, HOST claims to reduce dust mites and allergens. How do they do this when heat and chemical action are not in play?

Thanks in advance to all who reply. I'm just looking to understand and add knowledge to my business. If you can convert me to HOST then I'm all ears but at first blush it seems like a lot of sizzle that goes against all that I've been taught about carpet cleaning

Regards,

Mike