If people can do there job well enough to get promoted, that does tell you that the interview process is broken and not indicative of how well someone can perform on the job.
Also, our current society don't respect slow but deliberate thinkers like June Huh and expect them to perform better at a sprint (interview) rather than marathon (job environment).
No. In every testing or selection system there will be people who could have made it, but didn't make the cut.
Either we can accept some amount of arbitrariness, and that there are plenty of opportunities (try again next year?), or everyone who didn't make it can decide to cheat (they're probably good enough right?)