Unlike the PS3 or Xbox 360, the PS4 does not allow native USB save copying for most games using the standard system menu. Borderlands: The Pre-Sequel requires a workaround.
Borderlands: The Pre-Sequel suffers from a brutal endgame grind for very little reward (no real raid boss like Terramorphous). Modding your save removes the friction. It allows you to experience the beautiful low-gravity mechanics and the hilarious dialog without spending 200 hours farming The Sentinel for a single Legendary Class Mod.