Who says you can not take your car to Shogran or Saif-ul-Malok? You can... will you be able to bring back you car in one piece? God knows.
The point that people are trying to get across to you is that you 'may' screw up you car while trying to go there, no-one said you will not reach there or come back, you will but your cars shocks, excels etc 'may' be screwed big time. The road to Naran is pretty smooth, what I will recommend is that you park your car at Kewai and hire a jeep to Shogran, if you love your car. I went last year to Shogran via jeep in July and the road was so messed up, muddy and dangerous.
If you wish to try, no body is stopping you, you came to the forum for advice, people are giving that, if you don't like advice's, don't ask questions 