I use it maybe 1x a week in residential setting when the stairs are rat nasty. Honestly, most of my residential clients have pretty clean carpet. I use it on almost all CGD stairs as most of these places have hard to clean stairs. I actually hate using it as it spits pre-spray and dirt all over my shoes, so I make my chimp do it.

But, its a good tool to have when its needed.
On another note, I dont always follow all of those steps for cleaning stairs, many times I just use my greenhorn stairs tool as its good enough. The video was mainly used as illustration to show what were capable of to our clients.