I think this will encourage people to establish trust with each other when they need to transfer items. Most servers I played did not have dual-clienting and we used to do fine. Now all I see is afk priest/linker standing in corners.
I know some people are against it, but I would like to ask you to try it for a month, stop whining and give it an honest try, who knows you might even learn to like it, party with people, socialize, it's fun! It's how the game was meant to be, and honestly, everyone should be able to level without their personal buffers..