There is some truth to this but snowblades weren't quite the right tool...
We used the Elan Psx for a couple years. Generally, the 123cm I think. A short carving ski. Damn, they were fun for big carved turns at speed on firm., with poles! I had some big wrecks on them.
We only used the one size. However, it was supposed to be a three size progression. 113, 123, 133. After we got rid of them I acquired all 3 sizes. It was quite a challenge for the shop I used to use to grind the short ones. Since it was late March or April, they were amused.
The biggest issue was the terrible dry, hairy, bases. The mt shop refused to wax them. The problem was, in certain conditions they just wouldn’t move. On the little pitch steep enough to get moving, once they broke static friction they accelerated too fast.
Many of the instructors carried wax.
Very short skis place a premium on fore/aft balance. With rental boot issues of: way too big, unbuckled, buckled with the tongue outside the clog, two pairs of thick socks, jeans and sweat pants in the boot, boots on the wrong feet, etc., they’re probably not the best.
Even for a good skier, you can’t really relax and glide on something that short.
Snowblades were killed by their non releasable bindings. Many shops refused to rent them for the broken leg factor. Everyone had snowblades in the early 2000’s.
They were other good options with releasable bindings, but the fad died out and almost no one moved on to the others.