Kyle, I think what you're missing is that IQ and personality tests are only used for things like entry-level and graduate jobs, at large companies.
As has been mentioned, they're used for more than entry-level jobs. And even then they're not necessarily useful. Again: just an apparently fair way of choosing randomly.
Star graduates are expected to jump through numerous hurdles just to work at a prestigious firm which then treats them like shit and pays them a humiliating salary (less so in the US where 6-figure starting salaries are common).
Much as in medicine.
I would suggest that in law, you are perhaps driving out some people who would have been very good, while keeping the more desperate sort with no other options. Certainly we can see that in medicine, people have successfully defrauded others about their credentials - people with no medical degree successfully posing as a qualified doctor, working alongside other qualified doctors, for 10 years or more. This suggests that the rigorous testing is not actually able to test job-related competence, and/or that actually qualified people aren't much more competent than unqualified ones. Which concerns me as a potential patient, but there you go.
You’re thinking about everything on to small of a scale. I work with companies that have 150k+ hires per year for a specific set of roles, hell I worked for a company with 5 million + applicants per year for entry level jobs.
I would suggest that after a certain level, economies of scale have diminishing returns, which eventually become negative returns. Most of us are astounded that people who win the lottery can end up bankrupt, how much more astounding is a multi-billion dollar company collapsing?
BTW...impressed by your lift.
Don't be. My gym's a small sponsor of a powerlifting meet going on right now - women will be going in squatting 250kg. Not drug-tested, of course, but it's not like drugs double your lifts, they're all remarkable women either way.
From training people for health, I think if you can regularly and reliably deadlift your bodyweight for work sets, you've probably reduced your chances of (further) back injury as much as you ever will, about the same for squat, and you'll be fine for recreational sports - nobody wants to be the guy who pops his ACL playing lunchtime soccer in the park next to work. Essentially everyone under 50yo who is not on a disability pension can do that in 3-6 months of not trying very hard.
Of course, we can and should do more. But DL and SQ about bodyweight is going to be pretty protective of you, keep it up and you'll never need a walking frame. Regularly doing some sort of overhead press will cut down on all those shoulder issues you see in desk workers.
Obviously we were just joking about the deadlift assessment. But it'd go a long way to reducing workplace injury claims. It's sure as shit needed in physical jobs, which includes things like nursing. It doesn't matter how awesome they are if they're off work with a popped disc.