The "M Adaptive" is a bad description for what the system truly provides, which is the load-leveling rear air suspension with dynamic dampers. DHP alone doesn't give you that. DHP provides several things, but the main benefit is 100% torque vectoring to the rear outside wheel in a corner.Don't you think that DHP option is the most 'powerful and sophisticated ' suspension and steering option and you don't need M-adaptive suspension ?
My personal opinion is that if you feel the need to pay $6000 for handling packages ($1500 for rear air/dampers + $4500 for DHP) on a 5000 lb SUV, you may want to re-think what you actually want out of a vehicle as there are some better choices that might fit your driving desires better.
That being said, I wanted to double-check those prices and found that the BMW USA build site requires you to remove the M-Sport trim line to add Dynamic Damper/Air Suspension, regardless of whether you select the DHP. I do not know why that is, though there were rumors that you can no longer add that on X-drive vehicles. Previously, if you had M-Sport, the DD/AS option (commonly called "M Adaptive" on here) was reduced in price to $900 from $1500 if you'd chosen the M Sport line.
Here's a screen shot.