You can ignore the Jews but who gonna do that unless you need to, since you are new and don't have the HEs and or the Firepower to grind ULtimate. For me, the Jews are as essential as the SSR and the Eido. Which in the End means you need 5 Gold Mats less, compared to now.
But sure if we only look at the SSR/Eido costs, then you are completly right about Advents being less grindy in the Future.
Mh can't agree on that you can just spend 100 Seeds+ to finish Ragnarok Raids fast and then collect 200 Divine with your natural regeneration. You gonna get all the Seeds back with the Gacha/Rewards. Seeds are easy to get, but HEs are kind of rare and you need so much of them for one Advent. <.< I really hate Advents because we need way too many Mats. Also you can just leech in Raid Events while you need to do everything by yourself in Advents. A new Player might be able to finish a Raid Event but he will fail miserably in a Advent Event.