Sounds better than some systems I have read about -- spokes should still be able to turn without breaking the seal.
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OK, tube is maybe better. Follow me on this .....
You have to fight to pop the bead on the tire. 90 psi is not unusual.
With no tube, how are you going to get there?
If the catywampus bead won't seal, you got no pressure build up at all.
Without pressure you got no way to make the bead seal, much less pop.
Without a tube you could maybe possibly get caught twixt the rock and the hard spot and jest sit there hissing ....
Car tires get past this with a massive air blast shot at the bead/rim junction by a ring of large nozzles and a big air bottle (trick is built into the tire machine)
You could use Justin's trick of starting fluid and the thrown match ....
yikes