The point being made is really that SE does make a lot of content, it is just designed in a way that you are done with it a lot quicker than many players would like.

They make all these dungeons, FATEs, deep dungeons, variant dungeons, Island Sanctuary and it is content but that doesn't mean it is engaging content to many players and so they could get these bosses, all these mechanics and all these environments they worked so hard on for months and do something with it that makes it more challenging or more engaging over a longer period of time, which is where the arguments for things like Eureka, Bozja, relic grinds, or copying GW open world come in.