I'm sure we'd all benefit if the decaying feature was removed entirely, since it provides nothing but inconvenience and frustration to most players. It'd be like losing a fixed amount of exp per day for not killing stuff.
I don't know about most situations, but I'm sure not everyone can afford to cover the cost of making something every day, as materials can be expensive or scarce, depending on the server.
I feel you, man. It took me a while to get used to the DoT after it was implemented. The more you die at the harder bosses, the more you'll learn about their attack patterns and mechanics.
I'm having the same issue as well, but I think it's just a case of Nexon being Nexon at this point. I had zero issues before this update, and everything I've tried results in the same error message, so I'm just going to assume this is on their end, though they'll never admit it.