So to recap the thread, the new style is definitely designed to be more aero-dynamic and quiet than the older raised style. Virtually every cargo box these days from Thule/Yakima have universal crossbar mounts, but I can see how people with older roof racks might not be able to install them on the newer style. With the moon roof, the technical weight limit is a whopping 45 pounds, but it's clearly a center of gravity constraint. Who doesn't get the moonroof?
I have a
https://www.rackattack.com/cargo-luggage-racks/cargo-boxes/yakima-skybox-lo-carbonite/ which I felt is an excellent match for the Explorer -- low, but wide profile has low noise, still has 15 cubic feet of space, opens on both sides, and raises my height from ~5'11" to ~6'11", so while I couldn't get into some underground parking areas, I was able to get into others -- didn't try unless it was 7'2"+. It opens on both sides, and handled a lot of skis/snowboards, enough to match the passengers, but maxed out at 2 snowboards... skis weren't a problem. On the highway, was remarkably quiet. The roofrack empty weighs 52lbs. I bought it purely for skiing -- and the cons on this is it won't likely fit anything but small sized luggage, ski gear, camping gear, duffle bags, etc.
The low weight limit on the Explorer is ridiculous, but I figure low and wide is better for center of gravity than having a small roofrack that installs on a single side. I was easily carrying an additional 50+ lbs of ski gear inside. It's not like these cars are being raced around corners, but I'd also probably also avoid even light offroading with a loaded roofrack. For city driving and trips to the mountains, I think it's totally fine. But the funny thing is, you see promotional materials with canoes on top and they sell cargo boxes too that clearly break these weight restrictions.
I'm loving my Explorer!