Thought I would start a conversation about this, due to it being an issue I have with reddit. With the use of communities being tied to their url, it allows a broad topic to be cornered to a specific view or usage of the word. For example, feminism on reddit being run by a islamphobic MRA, forcing the usage of oddly named feminist communities that receive less views than if they had the standard feminism url. Antifa being run by fash. etc. Now, due to the focus of the site, it may not be necessary, but it could be.
This was/is an issue with gaming usernames on some platforms, and the two ways to solve this that I think have been successful are the urls tied to numbers, and naming have a non-user controlled suffix number.
Steam profiles come with a number attached to it /user/1023045. Blizzard accounts come with a suffix attached to the name. bmrgould#102334.
A concern that I can think of may be reduced site reach on search engines with less keywords (community names) in the url. Though the role of a community title may be good enough.
Personally I'd like to see the ability to have communities with the same name, but run with different focus. Allows different views, and community directions. Though as said, it may not matter with the scope of the site.