Hi 1337Thomas,
Thank you for going proactive with Skyline.
Skyline recommendations are based on the rules engine and the rules are based on KBs, Whitepapers, VMware Docs, Best Practices, etc. The example you've mentioned is still not part of the rules engine.
Currently, findings and recommendations take 48-72 hours to reflect on Skyline Advisor. The email notification is triggered when there is a new critical finding in the environment.