Although if you make multiple characters that are supposed to be related and know each other, it would be nice to even maintain that illusion by sending messages and gifts between the two. I think it would be even cute to screen those messages an such :3 it's all just in how you play. Different games have different methods and you do have to make do with what's available unless it does get changed.

So ultimately just saying I see the benefit of both ways and yes, more inventory would be nice but you can also pay two dollars extra for another retainer... Whatever happens, people will utilize whatever systems, but I do believe that they implemented this to stop real money trade in game in the first place, since you have to friend someone in order to mail them and be physically present to trade. So... there are a lot of things to consider even when making small adjustments like this seems to be.