You have to understand though that eventually the lower level content may become completely irrelevant to end-game players, and then there will be too much disincentive to help newer/lower level players get through that older content.
Hate to bring up this games predecessor again, but it provides a good example. FFXI's Airship fight section of one of the story lines. There are a series of quests/fights all leading up to unlocking access to Sea--and all of them are level capped. Originally, any gear over the cap would be simply stripped off of you (they later implemented level synch so you didn't have to have alternative gear). If you didn't have a supportive group of friends/LS mates willing to set aside large chunks of time to walk you through these runs in gimped (or later synched) gear... you had to sit around and shout for these "altruistic" players to help them out. It could take some players an entire weekend just to knock out one or two of the major runs because no one wanted to be forced to do level 60 or lower content when they were in psuedo god-mode at 75 with top end-gear equipment and merits. But... after SE unlocked player level caps (eventually letting us hit 99) and also uncapped these areas and fights, they only needed one person or at worst two for most of this content to help them get through it. Two pet jobs could faceroll about 90% of the then older content if they were decently geared and knew their jobs. And suddenly everyone had access to Sea, Sky, Dynamis, finished TAU and WotG story lines.... and the newbies got lots of help casually without having to shout around town all day.
The point, in case you missed it, was that penalizing the players too much with level synch/cap hurts the lower level/newer players you guys keep trying to champion. It's not a theory... there is clear precedent for it... and we are seeing it being played out to some degree already at the current ilevel restrictions. And you guys want them to drop them lower?
Those who forget their history are destined to one day repeat it....