No matter what pre spray you use it has to come into intact with the dirt to do its job, so it's dependant on the depth of the carpet pile a light mist might work on a flat pile but anything deeper requires a heavier application.
I've used micro splitters For 10yrs, I.ve tried practically every other prespray that has come onto the market...... I still use micro splitters 95% of the time on carpets and 100% of the time on upholstery.
I'm not stupid ( some may disagree) I'm like every other carpet cleaner who is looking to make the job easier, if anything worked better that MS then I would be using it, why would I not?
It's the same with cold water rinsing, I have a lot of hassle creating hot water I would love to get rid of my diesel burner and use cold water but I went 3 months cold water rinsing then bit the bullet and reinstalled the burner. Cleaning is easier with hot water ( but not better)