Re: [w3ctag/design-reviews] COOP same-origin-allow-popups-plus-coep (#649)

@hadleybeeman drafted this closing comment which we agreed to in the week of [08-30](https://github.com/w3ctag/meetings/blob/gh-pages/2021/telcons/08-30-minutes.md):

> Hi all, 
> 
> We've discussed this in our W3C TAG meeting today. We want to thank you for a thorough and helpful meeting on this and COOP/COEP.
> 
> We want to summarise our thoughts here, so that we have the notes in one place, and then we'll close this issue. 
> 
> Our thoughts:
> 
> * We are concerned about anything that adds complexity to the web, confusing developers and making it harder for developers and site owners to produce websites. This proposal is substantially complex, though it does offer big benefits especially to users. 
> * We are still interested to hear how use cases develop. In our meeting, we asked if there was an assumption that, for example, a bank will never want to surface a PDF of a customers' bank statement on another origin. It sounded like you might discover that that use case does — or doesn't — actually occur in the wild. It will be interesting to hear how the various groups impacted by this respond.
> * We started a discussion with you all about how to shift the defaults on existing content to benefit from this proposal. On the one hand, that could be a very substantial shift for the web, which is always challenging. On the other hand, we are still behind our [Evergreen Web](https://www.w3.org/2001/tag/doc/evergreen-web/) finding and recognise that everything needs to upgrade. So we are interested to hear, in due course, how you want to explore this.
> 
> Thanks again, and we'll be keen to see how this develops. Please do come back to us as you learn more from your work.



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