Nissan moved the Pathfinder upscale, and the Xterra is supposed to take over its vacancy, but not really. Since most SUVs aren’t sold for their 4x4 capabilities, Nissan probably opted for the All-mode 4WD for top of the line model to bring in more cash. To keep the cost of the base model Xterra down and Not to complicate the assembly process at the plant, one 4WD system is used on all models. Nissan actually made money, and still is making money, they probably want to be as efficient as possible in every aspect of their business operation, which will include dropping less model options.
My brother had a 98 Pathfinder, I loved that vehicle. He traded it in for a 05 Element, which is more useful for him (and his business), and lowered the operating cost very significantly (mainly gas).
The All-mode AWD in the X-trail isn’t anything like the one find in the QX4/Pathfinder, and they are not designed and build for the same purpose.
You will have to look into Jeep, Toyota, Ranger for future replacement. GM has/had a good all-mode 4WD system, but one has to search every hard as to exactly which model and what year it is, and why would one consider GM anyway.