It has been weeks and weeks since the HR graphs have disappeared from the Connect iOS app and online. I can see it if I switch on the web over to the old view, and not modern, so I guess there's some piece of mind that the data is available. However, that just makes it more frustrating that the problem hasn't been remedied.
I monitor my HR data with every workout, particularly for HIIT sessions to see intensity and recovery. Connect is becoming the Windows 8 of health sites - "just use the workaround..."