Robert M Watson Jr
Interesting with all the sliding of the feet. I always get 'dame' when the feet start to slide. By taking an actual step by lifting the feet one avoids all manner of obstacles/clutter encountered in the real world that do not clutter the dojo floor. When moving backwards sliding is not so bad for the following foot ...
Can one perfrom those movements with actual stepping instead of sliding without breaking the form?
My understanding of the sliding of the feet is to keep the feet as close to the ground as possible to help maintain or recover your balance. I would say you should lift your feet as high as necessary to avoid obstacles but would not practice lifting the feet too high if not necessary.
Someone with more time in Shodokan than I may have a better explanation.