Idk, but seems common sense that a channel on a split is going to flex alot in split mode and it seems that it would have to be made of some terminator type exotic liquid metal and plated laid/bonded in to be able to handle the flex, not get ripped out and not have the flex/hollow issues BA noted.
i was just thinking to myself how crazy it was that there are so many split manufacturers now and i tried to count em all up in my head and i realized there are enough that i need to write it down so why not here... then other people can add to it..
so in no particular order - companies that manufacture splitboards for public sale are:
1. Lib Tech
2 Gnu (the same but "different"?)
6. Never Summer
13. Roxy has a board this year - are they Lib too?
that's all i could think of off hand... please add to the list if you know more.
The first Lib split had no inserts but was also not designed to be direct mounted like a ski. That board still had to have inserts installed before use. In order for a board to be mounted like a ski the core would have to be thicker and reinforced to the point of altering the ride of the board.
I raced on boards in the early days that were still mounted ski style. Nothing ruins your day faster than pulling your binding completely out of the board mid carve. I ended up t-nutting most of my boards in the days before 4-hole.