You said: "the safest thing available right now when things go very wrong or for solo riding"
What do you base this opinion on?
Have you tried the 2 line safety system in desperate overpowered gusty conditions?
I've been riding (testing) my Xbow 16 upper limits in inland waters (sudden 28 knots gusts in average 18 knots winds). Not fun. Don't do it!!! . Insane jumps, though...
I activated the IDS at the end of the session just to see how it performed. Obviously a couple of friends were on shore waiting for the unexpected. I do not want to hurt myself! All went fine. The kite fell with no forward pull and despite the gusty weather it stood still "flagging" with leading edge sitting on the water as if there was not wind at all. IMO, the kite's safety was unbeatable.
I did not go for the kite. I recovered the bar, re-armed the chicken loop and relaunched the kite again.
That's all I can say. Hope I've been of help.