The interview was chock full of PR bullcrap.

In the same interview, they say it's niche grind content for elite players, but the designer of Eureka himself admits that it's easy and boring, so much so that HE afks in it.

Q: To think about it, FFXIV battle contents has the fun of learning the mistakes and getting through mechanics and specific rotations to make sure to have output from everyone. However, in the field, all you do is repeating the best damaging rotation and continuous hunting makes it mundane and sleepy... Do you have any plans to work to change on that?

N: We of course expected that kind of receptions from such part. However, even if we make Eureka bound to gameplay different to FFXIV damages the freedom to it and all about being sleepy means you can do that without much thought into it. Eureka could be the content that you visit whenever you don’t feel like doing too much work. Sometimes even myself just raise the hand (ノ) while watching a movie or something and it felt like giving the atmosphere of “I will logon for a while” ready so i think it wouldn’t be that bad to what it means to do Eureka.