I've also run tubeless in snow flakes besides the LS wheels, which do have the tubeless hump to retain the bead missing from non tubeless rims.
There are arguments for and against, that pretty much balance each other out. One good one is that if the rim gets bent badly enough, a tube will still keep the tire on the rim and hard, where all air would be lost running tubeless. But frankly, that's not an argument for or against tubeless rims - more of an argument for tubes.
It's time for a new rear, and if I recall correctly, the last time I replaced it I left out the tube but didn't have a proper valve, so modified one from an old tube. It works, but besides being a little bit short, loses a few pounds over a month's time. I'd like to find the proper valve stem.