Update - Disconnects and Latency Issues

What you've stated is a simple and routine coding/scripting practice to prevent things such as dupes and avoiding interrupted/incomplete logic.

this is an understatement.
I've taught a 3rd grade class to write their own transactional DB and they did better than Nexon.

Uninterruptable transfers between tables is one of the most basic transaction concepts and is quite literally the textbook example of why you would want to use a tranaction.

Hopefully people looking at this and realizing for the first time exactly how minor of a change it is to enable this will better understand why Nexon is so poorly respected and why so many are so exasperated with them.