I'm sure this has been discussed a lot already, certainly over here: 📌 Introduce tags[] in module.info.yml file to categorize modules by provided functionality. Postponed: needs info and here: #2042443: Move modules related to web services to a separate package on the module listing page →
On a default install of drupal 8 you get 2 packages, Core and Multilingual.
When you install Foo module the configuration is not config/core/foo, it's in some sub category like admin/config/development/foo, or admin/structure/foo or whatever.
I would suggest that we separate out the Core packages into similar subcategories on the modules page: (example package taken mostly from the configuration sub menu)
I'm not suggesting that we use those exact names, but something similar to the url subgroup they belong to for continuity.
I am suggesting that they all start with 'Core' so that they are easily differentiated from contrib modules, and they all naturally group together.
I think this would be a big usability improvement, and a quick win.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
As far as I can see this should have been closed as a duplicate in August 2013 as per #6
#1355292: Come up with better alternatives for groupings on the modules page →
📌
Introduce tags[] in module.info.yml file to categorize modules by provided functionality.
Postponed: needs info