Not necessarily - it could mean that at some point they believe they'll need to create folder or file with the same name as a team, and they don't wanna have to deal with weird collisions.
It's been a while since I've used Teams+Sharepoint, but I vaguely remember being able to have a Sharepoint workspace per team channel, and then being able to mount those workspaces as a shared/network drive. Stuff that might end up in the workspace is like... shared/uploaded files or something?