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I don't believe that it's accurate to say that a blow off is likely at 80 psi on a hookless rim and tire setup - that's 1.1 times the 73 maximum. Enve has seen tires go up to 140 psi before blowoff occurred. I've taken several setups to 85, just as a test. My normal pressure is 52-55. I do go to the effort to calibrate my pump gauges. My old Silca pump was reading 8psi higher than actual, so it got the tiny 0-160 gauge replaced with a much larger 0-100 model. I also check a new pump against my gauge standard.
As for why hookless, it's most likely to reduce scrapped rims due to hook defects and to simplify the molds.
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