If anyone thinks there is a more capable road going luxury SUV, they misunderstand the capabilities of a FF RR.
No direct ownership experience of a 405, or 322. But our family certainly but two P38s through their paces in the 12years or so they owned them. Towed up to, and in excess of the 3.5t limit and tested the off road ability as much as anyone who doesn't do it for sport.
My criticisms of that car would be two-fold. Firstly no suitable engine - the 2.5d and 4.0 we had were both arthritic (4.0 was better but still not adequate), going to the 4.6 only traded a few bhp for an engine made of chocolate.
The second was reliability, not the drivetrain as such, this had faults, but was worked hard. The issue was electronics, air suspension and general poor design (failed door lock meant that the LR advice was to cut the door off).
I have first hand experience of L322s - fixing countless faults that shouldn't have been there in the first place. The 405 is getting no better reports than the 322 did, so I've no reason to believe it's any better. That said, I would love one, as cars go, they are about as "me" as cars get, but I just don't think I could live with one.
My point? Focussing on off-road ability and other attributes that are used by 0.1- 0.01%.of buyers rather than designing and screwinf together cars properly seems rather counter intuitive.