I'm with you on those counts, I just don't feel the need to mess with all that when I can just go in a stall and do the silent-against-the-bowl maneuver. And some days I'm very lazy, I must admit that.
So many people have so many problems with every pre-existing STP style, from the coffee-can DIY method, to the 2500 dollar prosthesis with medical-grade tubing or whatever the hell it is. I do not want to mess with all that either.
Yes, it would feel natural standing up but it doesn't feel natural pissing down my own leg one out of five times. I don't call that a positive tradeoff.
So, sitting down for me until my brain decides I need a urethral hookup and all that good jazz.