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.
That is good news. Do you…
That is good news. Do you happen to know if 15.1 also fixed the Siri bug to allow it to once again play voice mail and to delete reminders all using Siri?
That appears to still be broken
I hate to be the bearer of bad news, but according to my testing, those items appear to still be broken.
If I ask Siri to play voicemail, for example, it says, "I can't help with that, but you can open the phone app" and gives a button to allow you to do so.
If I were you, I'd keep reporting these bugs to Apple accessibility.