well it kind of goes both ways.
Why WOULD they need to be readable?
The paradigm of "least privilege" as a general guiding principle has been around for a long time.
I am not going to argue that there is a huge value in making these things non-root, but at the same time, you can't really argue the other way.
While it's relatively easy to get the data from other sources.... it's not zero difference in effort (esp forward looking). Barring any need for these files to be world readable.. they're better off not.
Again not for the huge gain, but because there is no reason for them to be.