I've had many similar conversations with youngling Ph.D. students about the fact that certain people give them impostor syndrome (specifically on number of publications) and on Googling the person they've padded their "Journal Articles" CV section with conference proceedings. 
I've never been on that kind of hiring committee you mean (i.e. for a permanent position) but I wonder how much is conscious/unconscious on an individual level and how much is literally in the "rules"/explicitly written down? I have been on other hiring committees and FWIW no IF
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or even journal names were mentioned. But of course postdoc and RSE jobs aren't the same as permanent positions and my experience is tiny either way.
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And "not mentioned" doesn't mean they didn't play some subconscious or latent role of course... Sadly, I've no real ideas (other than like you just did, mentioning it) how to address either since changing institutional policy and personal biases/preferences is really hard.
End of conversation
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