Their response is the most retarded vision ever to come from a developer. Players beat the game using strategy! Knowledge over game mechanic and job mastery. And the ability to work together as a team to utilize your groups strength and knowledge over monster abilities and behavior. They should focus on creating this type of content. Not cheap NMs that will wipe your entire alliance in one shot move. And certainly it should not be based on how elite your gears and weapons are. Those things will just make the battle more manageable and controlling the chance of wiping. Gears are great reward for beating contents but it should not be top priority and strict requirement for you to do so. Empyrean +2 and Relic +2 gears should be more than adequate to beat these contents. As well as normal Magian Trials elemental weapons.
There are numerous great example within the game itself that the developers are able to create great balanced content. Zilart, ToAU and Abyssea are two shining examples on how to create enjoyable content that last for years.