Like a therapist, except she helps you sort out your crackpot physics theory https://aeon.co/ideas/what-i-learned-as-a-hired-consultant-for-autodidact-physicists … 
@Jayaravapic.twitter.com/I6aYG07YU3
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you may want to see "Jepsen" tests of existing systems vs vendor claims
I think @aphyr is pretty much the @skhd of DS, e.g., https://aphyr.com/posts/317-jepsen-elasticsearch …
oh and don't get me started on crypto, which has opposite problem: math necessary but not sufficient
so you have two kinds of cranks: one that implements their own crypto libs from scratch, other...
invents crypto algos. The former is MUCH greater problem of course.
(given refuting a cranky algorithm is easy, but finding vulns in code takes time.)
many do, they will aim to try to sell you systems that never fail and give exorbitant guarantees...
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