I feel a lot of people with this argument either never played XI, or played it very little to understand that Eureka nor Blue Mage are anything like their XI counterparts. Granted, you can argue that Eureka has elements from XI, but they literally took Vulkurm Dunes leveling and just expanded it across multiple zones. If Eureka was a lot more like, say, Abyssea or Dynamis, it would have probably been received better (whether it would actually be better is a different discussion. But at least it would be more than farming mobs for 3 hours).

With that being said, I'm not for XI being in XIV. However, I'm not against it either. I just wouldn't really tell them to "stop" porting stuff over, mostly because they haven't really ported over anything from XI aside from leveling.