Sorry but gold farmers are not "fundimental" nor are they a "mechanic" of MMOs. Player to player trade is, yes, but your OP is a stab at the folks who are against transferring credits directly, and for a lot of really good reasons.
Gold farming is a huge mess, and it makes a mess of any MMO they invade. There has been a lot of reasons given in this thread why it's no good. I managed a CS staff that had to deal with gold farmers, and I will refuse to do so again. Resources get shifted to combat them, game systems get changed to attempt to combat them, and then get changed again and again. In the end, the only way to combat them is to take away the few things that enable their behavior and all the out-of-game bad things that result from it, direct trading and player auction house. FDev went one further and limited their cash shop to cosmetics. As both a professional in the industry and a player, I salute Frontier for the foresight to head off all of those problems long before they could ever start.