As a user of mabl, I want a place to report defects where I can:
1) search existing defects to see if I'm not creating a duplicate
2) file a defect (with proper artifacts like reproduction steps and screenshots) and track its status/progress
3) suggest and/or learn (e.g. in comments) about workarounds for existing defects if they exist
It seems to me that a slack channel isn't really fit for any of the above.