You may understand why, for someone who has all of the same problems of work-life balance and the exact same working environment, but with no job security at around a third the pay (and no benefits), why this argument is not very persuasive.
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Asking junior faculty to reform how people get tenure while trying to get tenure themselves while also managing relationships with some of the same people that adjuncts deal with is tough, and probably better done collectively at the dept. or uni level
That's fair - I am using TT here to include folks on the 'post tenure' side of the tenure-track railroad. And obviously, in most departments, it is the already-tenured who are in the best position to enact reforms.