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Devil's advocate - won't this tend to bolster the outdated attitude that the front end must be pixel-perfect?

It depends on the project. But when you're dealing with mobile devices you don't get to test even a fraction of the models available unless you've got enough scale to have a dedicated testing lab.

I'm not sure I consider that to be true. Why is pixel perfection out-dated?

Perhaps because rigid constraints are useless with the number of different devices out today, and layouts should instead be highly adaptive?

No that's wrong. The screenshots are not based on one device looking like another. It's based on one device looking like X all the time.

For example this uses Firefox, if all I change is something in the backend. My front end should look the exact same before the change and after.

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