I don't know how did you come up to this conclusion. Roughly every single PAF air base comes within 450kms range of the current configuration. Same goes for the bridges that span Indus river. Extended rage at 900kms will bring every single square feet of Pakistani territory within its range.
If taking out air bases with impunity is not strategic value, then I wonder what is?
The idea behind 800+ km Brahmos is to take out key town of Golmud in China-
1- It is where the Rail link to Tibet starts-
2- It has an important air field-
3- It has an Oil refinery with huge oil storage all supplies to Tibet come from this-
4- The best road to Tibet starts from this place other road from Chengdu via Camdo takes 10 days and is treacherous besides being near to Indian border while another route is via Kashghar which is also have similar problem-
5- China has missile storage base there- DF-21 and other Long range Tels are present-
If the range of Brahmos can be extended to 800-1000km this town has enough strategic assets to qualify as a Juicy target- for well over 1000 Brahmos strikes-
All Pakistani assets are covered under 450km range Brahmos- Even the newly constructed missile storage underground tunnels near Khuzdar in Baluchistan- It was done to to escape the wrath of Brahmos(290km range) as all other installations were covered by Brahmos- stupid Pakis-