I just spotted that Siri has regained the ability to send email. This capability vanished with the introduction of iOS 15 and also vanished from earlier versions of iOS. I have been able to test Siri's email feature on iOS and iPadOS 15.1 and it also works on iOS 15.0.2. I guess it will also have returned to iOS 14, but I can't test that. I had written a Siri Shortcut as a stop gap but it was beset by some Shortcuts bugs. It's really good that Apple listened and acted on this one.