There is something wrong with your jet/mud/arm analogy, because it doesn't translate the real life results. The size, location, mobility, etc. make a difference.

Also, these toilets come with a warm air dryer as well.

I also saw them for the first time at Google, and then I bought one for home. It saves a ton of waste and you'll be and feel cleaner afterwards.

Granted, it does take a little more time to exit after you are done. But, if people were really in a hurry why would they keep a magazine/book by the toilet?