Yeah, I would really see a logical explanation on how preventing you from sending YOURSELF items somehow hinders RMT.

It just makes no sense, RMT is done when people trade with others, not amongst their own characters on their own accounts.
Also, RMT people already have multiple accounts so this affects them in no way.
Also, people will have to go through friends to trade stuff to themselves, which will increase the overall amount of trades (and cross-account trades) happenning, making more white noise and hindering their attempts to track suspicious transfers.

It is also not power levelling.. *I* farmed those items/gil on my other character, *I* spent *my* time to get them, its not like I bought them, or got a friend to give them to me.

Also, there are many good and legit reasons to want to play multiple characters. if you do not share them, great for you, but do not assume the same goes for everyone.

Having to go through inconvenient/clunky features because "thats how the game is made" is a sign of bad implementation. You shouldnt HAVE to go through all that to give yourself something that is yours. Especially since the reasons given to justify the inconvenience are easily debunked.