Not sure, how many of you liked the legacy useradmin page in on-prem and AMS but I am a big fan of this page. Especially while debugging issues. I am really missing this feature in AEMasCS and Adobe suggested raising a feature request with the pain points.
Planning to collect others pain points aswelll to consolidate and submit for the feature request to bring back legacy useradmin page in AEMasCS. Please do add yours!.