Because this organization hasn't had stability since Parcells.
I don't want to reach on a coach who is 12 years old and has 1 year of oc experience in the NFL even if it has been good.
This team needs leadership and consistency.
Hiring the 12 year olds has been a relatively successful move recently: McVay, LaFleur, Vrabel, Flores (maybe), Nagy (maybe) all seem to be good hires with minimal coordinator experience (McVay actually has the most of those with 3 years as OC). Zac Taylor is probably garbo but he got hired too early. Flores wasn't even a coordinator, technically, in the one year he called defensive plays. Judge and Stefanski the jury is out on, but Stefanski seems to be doing decently in Cleveland so far.
Meanwhile the "leadership and consistency" hire would have been either McCarthy - hard to argue Rhule was a steady presence before coming to the NFL although you could include him as an option. I say we get with the times and hire a 12 year old.