Why is it better to remove the 3 point arms? First, it only takes a couple minutes. There, they are out of the way to allow the hoe to closely couple to the tractors frame. There is nothing as slick as this setup on Deere's 47, 48 and 49. The hoe mounts rock solid, and the mmm still works. THAT is far better than being able to leave the 3 point arms on. And I am not even going to discuss hoes that mount to the 3 point. NO THANKS!
The 46 is a subframe mount, and loses the MMM That is a shame, even though there are happy owners.
On the ROPS I am comparing them to my setup where the ROPS is taller and behind you. The Deere 46 is also that way. Deere claims they design this equipment together, not re-engineer later. On my machine, that definitely seems true. I am very pleased with the system. I sure would not want a ROPS where it could smack my forehead (Massey shows the operator wearing a hardhat in their literature...) Deere makes you have the Tall ROPS with a loader, that makes sense.
Now, Sub CUTS are a little different, and I am sure that there are things they are doing that owners are plenty happy with. I do things that I am pleased with on mine that big TLB operators would snicker at.
I suspect, That at some level. Deere is saying: "If you wanna tlb step up to here..."