Plastic sabots are so soft that we may not need a cannelure, but we will put one in if we need it. Plastic is self lubricating and so "slippery" so we may need a little help from a cannelure, but we have to be careful because the cartridge headspaces on the rim. So far though, i dont see any problem with going with a sabot, rather i see more benefits. Also, by rigging up a little jig, the sabots could be drilled out on center and made to accept larger bullets like the .308 or .357, etc,. I guess that would give the .357 Sig a little run for it's money.
The only thing that should come between you, and any gun... is comfort... Get Agrip!
Your first and best weapon and/or tool is your mind.
Warning, anything I write is intended to manipulate you into using your mind.