OK thats great. In future hypothetical scenario, if lahore gets assimilated by Indians and Karachi is destroyed in bombardment. What else is left for you to defend and cover? Margalla hills, Thar and Waziristan! Pakistan would never be able to recover from those economic blows. Pakistan can very well survive and prosper without its capital. Because there is nothing more than some Govt offices, Head offices of money pit Govt enterprises and a beautiful Mosque built by Saudis.
If Lahore falls then Gujranwala would be a piece of cake and sialkot would be surrounded. All of these territories are tactically vital for Pakistan. It would strengthen the defense of vulnerable IOK supply route of Indian forces and push Pakistani troops on the far side of the Chenab River. And capitulation of those areas would act as a springboard for Indian forces to further occupy the AJK territories.
Pakistan's Railways network would be cut off in half and that too without any railways workshops and manufacturing facilities. Lahore's new and old airports would immediately be converted into indian FOBs within the heart of Pakistan. Then there wouldn't be any safe spot left to hide.
Lahore itself is a vital asset as India's historic obsession with Lahore explains it all. It's one of the most developed, advanced and populated city in Pakistan. It's the 2nd biggest business hub of Pakistan. And many vital assets and their families live in Bahria town, countless phases of DHA, Cantt, GOR 1 etc. too
. And no one would be able to proudly twist his well groomed mustaches on wahga border again.
What east Pakistan had to defend by then? Now their textile exports alone are more than the total exports of Pakistan.
All brains and no balls makes oneself an eternal slave