is some of this the blame of infrastructure planners?
I don't think so. Residential streets shouldn't expect heavy traffic, and it's ridiculous to design them for it.
So I hesitate to blame Waze
I agree. The administration and legislators are to blame.
Well, not "blame", they couldn't have anticipated this. But, They're the ones who need to solve this problem. Residential streets shouldn't need to be designed for heavy traffic, nor should it be illegal to tell people about shortcuts.
The solution, besides adding capacity to main thoroughfares, is to create laws and systems to prevent abuse. For example, No Thru Traffic signs, speedbumps, and systems allowing residents to submit evidence of lawbreakers (because police can't patrol every residential street). And whatever else legislators and the administration (mayor, governor) can come up with. That's their job.