Originally this was intentional in order to provide discovery for enabling the post types. But this was perhaps too “in your face”.

Without this patch, you see the AMP enabled/disabled radio button on CPTs that aren't AMP-enabled (or aren't logically posts, such as custom page layouts). Clicking the "edit" link won't make that content available; it will instead show you a warning:

Yes, that is what I meant was intentional.

I can see how this is confusing though. Is this shown only to admins or also other authors?

Yeah, if we show it then it should be limited to admins.

Just checked, even contributors currently see that message.

@paulschreiber Would showing the message just for admins (users with manage_options capability) work for your environment?

@swissspidy Showing the message only for admins is an improvement.

In addition to only showing for admins, I think it also should just be an info notice, not a warning. Or ideally, really not show anything.

I opened #2724 to discuss this more broadly.

This will need to be re-factored to implement in the block editor.

The PR also needs to target develop. So I'm going to close this PR in favor of opening a new issue to capture the full scope: #4593.