I’m not sure that A category being to wide was the initial reason [it may have been an additional reason later but I don’t remember seeing that, but probably missed it]
Reason given initially was
- All category boundaries have been increased by 5%, to make the difference between Zwiftpower and CE less apparent and confusing (because Zwiftpower uses 95% of your best effort over 20 minutes).
This thread
from August 2022 highlighted some of the potential issues and a year on I think they mostly still remain.