I actually have another question about this abuse. Why does trading interrupt teleport to begin with?

In other games teleporting isn't interrupted by trading. It is by combat. Not by trading.

Heck there's a reason why in wow there's a glyph for Bubble-Earth combo, but even without that the only thing that interrupts you is the combat.

Just thinking that maybe we should get some fixing about these multi-tasking things (like why am I unable to dye while I'm sit down, or while I can't queue with the chocobo out)

It's a minor thing, but I thought that this trade abuse thing is just weird on its own.