Hi,
How to gently inform few managers that access as SharePoint Site Collection Administration has to be removed for them, and we will grant Full Access for them on site level ?  🙂
any suggestion appreciated 🙂
It all depends on the reasoning behind it and the level of experience that these users have.
Personally I dont think that IT should control SharePoint Sites and that you should pass this left to the users – they tend to thank you for it as well.
In your case would it not be a better idea to use a seperate Site collection and not a new subsite. However the issue with Content Types, Site Columns etc come into play in this scenario.
Sounds like a classic “It Depends” answer I’m afraid