Summary pretty much says it all, on kde.identity users are far, far, far more likely to forget their username than their password since you have a completely broken username registration system as well (e.g. you do not allow the users to pick their own username, you automatically generate their usernames)

Reproducible: Always

Steps to Reproduce:
1. Forget your username
2. Try to log in to kde.org
3. Cry

Actual Results:  
Lots of crying

Expected Results:  
Successful account recovery