YoshiP stated that MMOs are trending toward F2P

[Naunet]

FFXI charged $1 extra for additional characters because we used them in exactly the purpose that we use retainers for - extra storage capacity and market board slots. Except XI didn't even give you the first two free and their capacity was half of a XIV retainer. So it's really about the same.

Those are full characters that can do everything another character can, not glorified banks with a face. Also, this isn't FFXI. A lot of us are paying full price for the sub so that we can play more than one character. But then SE wants to charge additional monthly fees for more bank access? It's ridiculous. Those retainers are going to end up costing you WAY more money than they ever would even in a f2p mmo. Actually, they probably already have.