Google's John Mueller said on Twitter that sometimes hard to understand and really complex URL structures can lead to pages being removed from the Google search index. He said specifically "many URLs ...
Google isn't concerned with how many slashes there are in a URL, so there's no need for an artificially flat URL structure. Google’s John Mueller says there’s no benefit to having an artificially flat ...
Google has updated its URL structure best practices help documentation - it was pretty much a rewrite but the overall guidance is not new. Google said they added "clearer flow and is easier to ...