I'd rather be pluging a tubeless than sorting out a puncture in a tube believe me I've been trough it. JJH
Swapping a tube is a bit more of a faff than plugging a tyre, that's true but after plugging, you're then restricted to 50 (in theory) until it's properly repaired or replaced.
Plus, it's not always possible to plug a tubeless tyre in (as happened to me a few months back) in which case you're left waiting for a recovery van. Had I been on my rally bike, I'd have been able to put a new tube in and be on my way within about 20 minutes. Luck of the draw though, I guess.
Linseal works in tubes and tubeless tyres as well and does a great job of sealing punctures on the fly so well worth considering whichever tyres are used.