Lack of standard dirs doesn't really matter in this case because the same dev writes the installer and uninstaller. But I do get annoyed that Windows programs put stuff in random places when I want to look into them, like it's program files, program files (x86), documents, roaming... where tf is %appdata% even

But it has directories and files inside, right?

It's only the program that is used to browse is different.

It's like you don't use explorer but regedit. It's the only difference.

On macOS it's not like you can always type what's inside the plist files with a text editor, sometimes you need to use 'plutil' anyway (if a plist is binary). So to browse Application Support you still often need thirdparty software anyway.

Years ago I did a small project that mapped windows hive (registry) files as a filesystem through fuse on linux. It mapped to a filesystem concept nearly flawlessly.

edit: can't reply anymore for today ('posting too fast'), so i just reply here: What is a file if not a key/value entry in a directory? Anyway, you can put custom binary data in registry, one value type is just "binary". But you shouldn't! Just like in Application Support - you can but you shouldn't. Registry just enforces it more. Entering regedit also requires to elevate it if you want to change system settings (HKEY_LOCAL_MACHINE). Changing user settings doesn't need elevation (HKEY_CURRENT_USER).