First off: I work for Microsoft on web standards & accessibility stuff and am focused a great deal on PWAS and interop currently.
I agree, there’s a lot of misinformation about this stuff. I’ve been writing and speaking quite a bit about it. Here are a few links to those materials:
Progressive Web Apps and the Windows Ecosystem
Your Site—Any Site—Should Be a PWA
Yes, That Web Project Should Be a PWA
Quite a few others have been doing great work on helping define what PWAs are. In no particular order, I’d recommend:
Betting on the Web
A Progressive Roadmap for your Progressive Web App
How to turn your website into a PWA
Progressing the Web
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