Old content is not made easier, its just not updated to current level and ilvl. That being said, the only reason to do it is because you want something for glamour or something like a mount or just wanna exp the story. It has no reward really once it's patch has passed, and while I loved XI's ability to keep things relevant it was only able to do so because the drops and rewards from that content still meant something 5 years later, nothing really means anything in this game so in the big picture it makes no impact on the game