It won't just "make it easier" though. It'll neuter the fight to be effectively pointless. When you get BiS in 5.4 or 5.5 go back and clear E4S. You'll obliterate him; skipping the entirely of phase three, and a good chunk of phase two. At that point, the dev team made a piece of content which will last all of four minutes and not a single mechanic will remotely threaten you.
The whole point of syncing content is because there's no realistic way to balance it with such a linear leveling system like we have. If they put it at i465 with no sync, we're steamrolling through which makes working on it kind of pointless. If they put it at i485—closer to the current ilvl cap—it prevents people who haven't been playing from participating. Considering Unreal is more geared towards the casual playerbase. That restriction makes little sense.
I don't disagree they need more content where our raid gear is relevant but that isn't likely to happen as this game focuses very heavily towards including everyone. For the exact reason you them to abandon syncing is why they won't. You'll be leagues above more casual players, thus it'll make content like Bozja less enjoyable for them. Granted, I'd actually argue the content would be worse for those of us with higher level gear. Why? They'll always balance things like Bozja, Expert and such around the casual demographic. I wouldn't find it all that fun going into Bozka next month and laughing as the i430 mobs barely tickle my i500 tank. Frankly, that makes the game boring.
As for why bother gearing. Ultimate. That's literally the reason, which is why I really think there needs to be three. Since this tier lacks an Ultimate encounter, parses are all you have. And while SE will never admit it. They know how much they benefit from FFlogs given how much people care over their logs. If neither of these activities interest you, then there isn't a point to gearing up. FFXIV is more or less designed that way.