Naskh is known as the servant of Quran. as it is the most used khat style to write Quranic verses. no other Khat has ever earned such a great popularity due to Quran. Take any Mushaf and what you will find is all Surah written in Naskh and the heading written in Thuluth.
Yes, you are right Agha, also this script seems wonderful with Tashkil (Signs over and under the letters). Naskh also used as an official script in most of Arabic countries' schools in addition to Reqaa one, and as you said all Mushafs are written with this script so it is the most honored and driven script in my opinion.