If someone is new to the interviewing process, then they shouldn't be doing interviews alone. If they don't know how to gather information from a resume, then they shouldn't be reading resumes alone.
You say that a bad hire is worth tens of thousands of dollars, but if that's the case, then most of what you said is irrelevant because a company that is smart enough to recognize this would be smart enough to never put a junior manager in a situation to make a terrible decision.
So they can learn from experienced interviewers who just make you leetcode and answer dumb stock questions (my biggest weakness is…)? What we need is for people to interview with zero experience and figure out a better way on their own, not copy a bunch of bad processes out of insecurity
If you've surrounded yourself with incompetent people, then you still shouldn't assume that everyone else is equally incompetent. Cynicism isn't wisdom.
It's either important and expensive or it isn't. I wouldn't be "shocked" by anything. I used to be a recruiter. In my current dev position, I have absolutely nuked candidates by asking basic questions that the managers (who were eager to hire someone to fill a spot) and other devs (who would feel uncomfortable if they asked the question and hence didn't) failed to ask. A candidate who will try to bullshit me about something he doesn't actually know is someone who will waste time on projects by not using all the resources available to him to find the correct solution (this usually involves being brave enough to ask questions if you don't understand something). If my future depends on your success, then I'm going to ask questions that will make me feel like I can trust my future in your hands.
If a manager is getting paid $150K a year and it costs $200K to fire a bad employee, then "when they're ready" is the correct metric to use.
You say that a bad hire is worth tens of thousands of dollars, but if that's the case, then most of what you said is irrelevant because a company that is smart enough to recognize this would be smart enough to never put a junior manager in a situation to make a terrible decision.