That's because terrain response requires air suspension, it is an integral part of the system. This comment epitomises the lack of understanding of these vehicles by those that haven't owned or driven them (understandably).
As to discussion about the reliability of the air suspension being the end of the world - forget it. Yes, things can happen but there are plenty of options out there that can mitigate almost all risk associated with its failure. Same approach is taken with handling that risk as there is for a known risk on any other kind of vehicle. Just different spares, tools and troubleshooting skills that's all.
The capability of the D5's TR system will leave the D4 behind. The main shortfall of the D5 will be maneuverability, anyone going from a D3/4 to a D5 will find themselves doing 3 point turns where they never had to before. The D5 has the same turning circle as the L494 which is what I now have, I can't tell you how many times during the 1st few months of ownership I was fruitlessly wrenching on that steering wheel trying to get that extra half a turn so I could make the maneuver I used to do with ease in the D4.
And Mario, rest assured that anything the D4s suspension will do, the D5s will do plus more including extended modes. D5s wheel travel is more than the D4s too.
Personally, if I were to buy another new Land Rover it would be the next Defender especially if it was like the D4 with the ruggedness of the last Defender and plenty of room in the arches for bigger tyres.

