Chrome is "now rendered fully programmatically including iconography, effectively removing the ~1200 png assets we were maintaining before,"
This is dumb. Utterly dumb. What they should have done is used vector assets, such as PDF, or if that's too "non-Google" for them, SVG or anything similar. Coding images doesn't make sense - you have to maintain that code and it's a complex effort for anyone to alter what's rendered. Compare that with simply swapping out a resource created in a vector art program.
Forcing the material design on Mac users is equally dumb, there's no point making the browser consistent with other platforms the users isn't likely using, but to make it fit in with the ones s/he *is* using. And having hard-coded the image assets, there's now no easy way to simply swap out one set of resources for another to allow that to be done easily.
Chrome will never be installed on my Mac.