Azure Information Protection Issues we have observed so far

Great feedback, just a few points, some of which you may know already:

The is dedicated forum for Azure Information Protection under Enterprise Mobility +Security that you might want to check out

There is an https://msip.uservoice.com/ site where you can submit new ideas, or find out what being asked for already and if they are being worked on

The Yammer site for https://www.yammer.com/AskIPTeam is great for getting direct responses from the Azure Information Protection team

Support for consumer email accounts (Gmail/Outlook) is in private preview, there was a great demo of it in last years Ignite.  Hopefully coming up for this year's Ignite, it will launch as a public preview.

For some of your other points, I'm not sure if that's the way its meant to work. I thought for organisations that weren't using Azure AD like what comes with Office 365 or other Microsoft services, https://docs.microsoft.com/en-us/information-protection/understand-explore/rms-for-individuals was an option but there is probably a lot more to it than that.