Earlier quoted context omitted.
What I'm reading here is that even as an experienced interviewer you struggle to make the format effective and equitable. Sounds to me like the format isn't worth keeping; time to hire more, and fire fast?
I never understand answers of this format: "status quo has flaw of some known, finite impact" time to "completely ridiculously overcompensate, overreact, and make arbitrary move?" I can't even fathom in what ways you think "time to hire more, and fire fast?" is more "effective and equitable"? You just shove even more risk onto individuals who might be getting their footing still. You're just turning a 8-9 hours commi…
You're tacitly expressing a concern that a fast hiring commitment would be riskier; but that's not necessarily so. A minimal set of filters are meaningfully effective: resume, references, and meet the team. Anything beyond that doesn't have just diminishing returns, it can negatively impact the company by narrowing the field of viable candidates too far.