Yes I did a full test of runflats at the Bridgestone test facility near
Rome, exploding them, running on the roads with no air in two tyres,
running on different test surfaces, the lot. I haven't done a tyre life test because that would have taken too much of my life. A partially deflated runflat where the puncture is in the tread can usually be repaired. If the tyre has ever been run completely flat it cannot be repaired because damage may have occurred to the strengthened sidewalls and shoulders. If you fill any tyre with tyreseal foam it damages the structure making the tyre unrepairable. Having had to replace a blown offside rear on a narrow hard shoulder on the M3 in the rain with my back only 18” from passing trucks (even after having called out police protection) I am in favour of any tyres that cannot blow out and can get you to a safe destination after losing pressure.