... not the right choice for multi-day rides on a road bike.
Interesting. What clinchers are you going to use?
I have ridden approx. 20,000 km on tubless tyres, a mixture of Sector 28's and Schwable Ones/Pro Ones/G One Speed (formerly S Ones)
In this time I have had 4 incidents where roadside attention was required. 3 I fixed successfully using the Genuine Innovations anchovies (I just poke a single "strand" through the hole and trim to around 5mm protruding). The other time the hole was too large and I cut my losses and fitted the spare clincher I carry (A GP 4Seasons "28mm"). I think carrying a spare tyre is wise with tubeless .. but then I think carrying a spare tyre is wise for everybody
Agree about the Pro One longevity, my rule of thumb is 2,500 km lifetime for a rear; 5,000 for the front. I had success with the Sector 28s and am probably too cautious a rider to have discovered their sketchiness.
One big surprise I had was when switching from Pacenti SL rims to H Plus Sons "The Hydra" - a quite different experience. The HPS rims are easier to mount the (Schwalbe) tyre onto but when deflated the tyre will always ("pop") demount from the rim, unlike on the Pacentis. With the G One Speed there seems to be a really good rim/tyre affinity. The tyre goes on with thumbs alone and "gapes" open in just such a way the bead is already sneaking into position. A roadside pump is enough to get it to ("pop") seat onto the rim. For this reasons I have changed my mind and am going to use these tyres (and
not Pro Ones) for LEL - in the event of a demounted tyre there's a good chance of reseating it on the road (and if not, I have my clincher/tubes to hand). In general I think this illustrates an aspect of tubeless use: you need to be really familiar with the precise set up you have: the way the tyres, rims, sealant, tape, valve cores, repair kits and pumps work together. This is quite an overhead.
Tubeless: when it's good it's very very good, but when it's bad it's horrid.