Sadly I think this is not necessarily a reflection of the fans being overzealous as much as not trusting the F.O. at all and hoping they go based off of resume/best org.
The best-run franchises of late have been hiring former players/internal managers. I don't think any Sox fan trusts the sox to know the good interpersonal skills people for that.
So instead, you'd point to: Melvin (no brainer), Kevin Cash (bullpen coach for Francona), Cora (WS bench coach though obviously a down year).
I think even in recent history, the first Ozzie hire was very popular. Sox fans from my memory were obsessed with that Marlins team (not surprising, it slayed the Yankees and Cubs) and he was their 3b coach and popular former player.
Manuel didn't work out, but I don't think anyone has a problem with trying out a 3b coach from the mid 90s expos and then Leyland's WS Marlins.
So I guess when our off-resume signings fail, I think fans want to go back to the IBM of coaching candidates. You would think Hahn/JR/KW would also feel that way, but JR at this point prioritizes conformity and congeniality to winning.