FYI, these were the reasons brought up a few months ago when they said mods would be delayed:
https://bethesda.net/#en/devnotes/cr...-for-uploading
"KNOWN ISSUES WITH PS4 MODS
PC textures are used. Memory and performance issues may occur. We are working with Sony on optimal texture exporting support in a future update.
Sound files are currently not supported. PS4 sound format is a proprietary format. We are working with Sony on sound file processing support in a future update.
PS4 Mod Storage limit is approximately 900 MB at present. Please do not upload mods larger than 900 MB. We are working with Sony to increase this limit."
Reposting for those that might be curious as to why.