Gearbox Software were already looking to improve the looting systems in Borderlands 3 with dedicated loot but they are taking it one step further with the mailing feature. Even offline friends can now receive loot you may want to share.
Borderlands has always been the go-to series when players wanted to group up, shoot and loot. That last aspect proved problematic when playing with strangers though as they could loot even the items they didn't need or needed less than their teammates, often known as ninja looting.
Gearbox solved this issue by giving players their own dedicated and instanced loot in Borderlands 3. Opening a loot container spawns separate loot for all participating players so ninja looting is no longer an issue.
Players can still get different loot though and certain items may be perfect for one teammate's build but not for your own. Naturally, this would involve dropping an item on the ground for them to pick up or use the trade system for a direct transaction.
Borderlands 3 will add another layer of quality of life improvements by allowing players to mail items to their friends or random teammates. This way, they will be able to transfer loot even if the other player is offline and the feature should make loot transferring much quicker.
Granted, Borderlands series is fairly generous when it comes to loot so it remains to be seen how much transferring it will actually require.
Furthermore, it is an Epic Game exclusive which will fend off some players who will wait for a Steam release. This will already split the player base but it's hard to imagine it will be hard to match up with someone else to shloot.
Gearbox already confirmed that no cross-play is coming either so PC players won't be able to play with those on consoles. It remains to be seen how the player base will pan out or whether the title will suffer from long queues during its exclusive stay at Epic.