Damn I thought this was a trollpost at first but you're 100% serious about this, trading is a major system in every mmo and I don't think removing it would be at all a smart decision.Ehm this would basically kill the game. On reboot you get quite a lot of meso and you can buy cubes with meso aswell so it's made to not have item trading. Reg servers are based upon that ppl trade stuff. Like when you get some rare accessories from somewhere, pitched boss set for example, and happen to cube 3 lines of wrong stat on it, someone will have use for it and buys it from you so you can make new one and no need to spend tons of nx on recubing and wasting the decent pot.
This will only negatively affect the minority of the population that uses trade to get stronger. All other trades are black market trades because pretty much all rare items or 3L are automatically associated with real money and the seller doesn't want any volume of mesos. Even if it were mesos, they would then be converted to money. Even common items are so common people don't buy them because they can obtain them themselves unless these are bulk. The bulk transactions are also never mesos. No one uses mesos between players anymore, and even if they did, they plan on "converting" it.
The game is far better with unhappy people than happy players breaking the ToS.
It was a skill that threw a singular star and did a bit of damage while healing for a decent amount. It was good back then to save on pots but I feel like it wouldn't have much use nowadays.