Really appreciate the time you have taken to send across the detailed feedback to us - helps to have more perspective from a different set of eyes.
I have answered some of the concerns you have raised. Will be getting around to answering the rest of them as well once we have more clarity on the exact issue.
@gja let’s think about how can we use this forum for at least some portion of Slash users queries. I reckon Jira service desk can be repurposed for high severity or sensitive questions.