My previous post was to edit and upload, not just to view, this suggestion is just to view .dat files
So basically, imagine this: You have just created an item, but the item gets corrupted so that when you join, the entire server crashes. You are unable to fix it without deleting every player's playerdata. Allowing us to view .dat files (Not to edit, just it shows the file in the folders, nor uploading) and delete them allows many bugs and data corruptions to be fixed if they occur, without allowing people to steal other player's builds and such. Allowing us to view/delete .dat files makes playerservers easier to modify and play on, allowing playerservers to be better than they currently are, while keeping the same prevention against people stealing data or other parts of a player's server.
I also made this post because I recently figured out that .dat files cannot be edited with text and must be edited via other ways, also don't let .dat files to be uploaded