The smear and dry method may be appropriate in some rocky mountain areas where you can't dig a cathole, but not so good on Mt. Whitney with 200+ people a day smearing it around, 17,000+ each season. It's just too many people and they tend to camp in 2 main areas. This is where toilets are the best solution, in my opinion.
Do that many fools actually go up the Main Trail every season? It's less mountain and more amusement park.
