[pfg]

Let's look at some studies:

> Participants washed their gloved hands with a suspension of MS2 bacteriophage and hands were dried with one of the three hand-drying devices. [...] Over a height range of 0·15–1·65 m, the JAD [jet air dryer] dispersed an average of >60 and >1300-fold more plaque-forming units (PFU) compared to the WAD [warm air dryer] and PT [paper towels] (P < 0·0001), respectively.[1]

Okay, but I'm sure just-washed hands aren't all that dirty, right?

> This observational study was conducted to evaluate [...] hand hygiene practices among college students. [...] Overall, 72.9% of students washed their hands, 58.3% practiced hand hygiene (using either soap or hand sanitizer), and 26.1% washed their hands adequately.[2]

I couldn't find any epidemiological studies, but this feels like good enough of a reason to stick to other options considering these things are a solution in search of a problem anyway.

[1]: https://sfamjournals.onlinelibrary.wiley.com/doi/10.1111/jam...

[2]: https://pubmed.ncbi.nlm.nih.gov/18538703/