Shite!!
Try going fast. Maybe even venture off road.
More shite!
Try going fast, in the wet. You know, over rough ground. No seriously.
Define Better? it depends on the shoe, the rider the intended use and has absolutely **** all to do with the price of said skate shoe!
Let me see, how can I define better. Stiffer sole. Padded inner ankle protection. Lace guards to keep the shit out. Strengthened toe to protect your...toes. Grippier soles, for more grip?
These are the things I've come to value in a flat pedal shoe which I find lacking in any skate shoe. Maybe I am just crazy for wanting a stiff, grippy and somewhat protective shoe for mountainbiking.
I'm not really sure what point you're trying to make, you're describing a load of ways in which DH is different to trial riding as if it proves the relevance?
Well, conversely I dont see how having a really really good flat pedal shoe is a hindrance to the trail rider? DH is going to expose the shortcomings of a piece of a equipment more quickly than most other forms of riding. There's a reason why 90% of riders at any NPS race will be wearing 5 10s - they work.
Surely you want your gear to be as good as possible whether it's a midweek blast, an epic all day ride or hitting the local dh track for a few hours, no?