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I guess it goes against received wisdom of keeping things as simple as possible and relying on tried and tested technology à la frame pumps, bar end shifters etc. If you rip a sidewall on a tubeless, it's a messy afair to sort out by all accounts. That said, I'd still want a tubeless compatible rim for off-road funtimes.
Polygon-
You're stuck either way with normal tyres if the sidewall got ripped.
It's still an advantage if you carry spare inner tube as well, the difference is simply that tubeless will be messier.
tubed mean inner tube can be repaired, I was thinking about carrying sealant with you, but would be redundant if the cut is a little too big for the sealant to be effective, a cut that can be remedy by putting something between the tyres and inner tube (like duct tape) to stop the inner tube from poking out.
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My commuter runs Schwalbe One tubeless tyres on Ultegra 6800 wheels, each filled with 30ml of Stan's juice.
I recently sustained a 2-3mm sidewall tear, with immediate deflation. Not having a spare with me it was shanks' pony all the way home. The inside of the tyre needed cleaning off with a paper towel, I then applied a regular patch to the inside and filled the small hole on the outer casing with super glue - I've not had any problems since.
I imagine repairing the inside of the tyre with a just regular patch, at the side of the road, would at least get you home.
edscoble
ds3000
I don't know actually, it's a good question.
Thinking about it, there are riders who rode on tubeless during the Tour Divide (in the past, it was slime inner tube which Jill Homer have positive experiences with) and it work for them, you still carry a spare inner tube anyway if all the sealant gone from it.
It's very very useful for MTB because of the increase risk of getting punctured, however on road, I honestly don't know, it's not necessary IMHO, I'm not the person to ask because I honestly can't see myself using it in the future, especially when tube/tyres worked perfectly well for me.
Also for those who run touring tyres on their tourer, like a Marathon Plus which is pretty indestructible already, I can't see a reason why you should go for it unless you want to reduced a tiny amount of weight (and increase comfort slightly).
(I don't run tubeless on my NFE, just lightweight butyl inner tube and tyres).