Problem for both countries is, even though China is a very strong country, without their bond of this current friendship, but would become alone. China may be very strong, but others are trying to encircle it to restrict its influence. China has many nations which are hostile or has problems with or are under western influence, India, Vietnam, Japan, South Korea and other countries surrounding the South China Sea.
And we all know of the problems being faced by Pakistan, thus its imperative that both countries stand by each other and help each other in whatever way possible. But Pakistan needs to do much much more to get itself on its feet to counter the world and be of some help to China.