The Taiwanese often use a method that works best for them. Moss is the cheapest and less labor intensive way for them to pot.
I have never sterilized moss before I used it. The quality long-fibered moss I use has already been sterilized!
And in the case of Phalaenopsis being set back years by repotting in any media, I find that to be far from the case in my 40+ years of growing. Phalaenopsis in my experience respond beautifully to being repotted. In most instances new roots form within 4-6 weeks of being repotted and floppy leaves firm up once again.
I find that using moss works well for some people, difficult for most. Why? Too easy to pack it too tight and too easy to pack it too loose.
Plus a lot of beginners use a pot that is way too big. Phalaenopsis is a monopodial orchid growing from one central stalk yet people pot them like they are sympodial and are going to grow across the pot.
A great many beginners tend to be overwaterers and drown the roots while a few are afraid to water enough. Their plants suffer as well. Personally I repot my Phalaenopsis every year and it works for me.
In short: if you find that something works for you, use it.
