Why Pakistan's military success is a monumental setback for the US:
Despite what we're often told about the US not being able to plan long-term, they've actually had a logical and consistent "China containment" plan for decades.
Most of us are familiar with the "island chains" (TW, PH, etc.) to the east of China. The US has attempted something similar in the west too.
For example, note the locations of Xinjiang and Tibet in the map below. Xinjiang and Tibet are China's westernmost regions. They are critical to China because many China-Central Asia-Europe trade routes pass through them - the US has been consistently stoking unrest in these regions for decades precisely to contain China by undermining these trade routes.
Then there is Afghanistan. It occupies a central location in Central Asia and shares a border with Xinjiang. We all know how the US tried so incredibly hard to control and hold the country - we might joke about the trillions they "wasted", but in truth it wasn't entirely irrational - the country is well-situated to contain China by destabilizing Pakistan and Xinjiang, and the US has almost certainly used it to those ends.
Here's where Pakistan's military success comes in - at this point, it is likely clear to the US that they will not be able to destabilize China's western provinces enough to undermine trade routes. China's hold on these provinces is just too strong.
Logically, the next best "containment" effort that the US can attempt is through countries just west of China.
Pakistan is one such country. Containment-wise, it is especially important because Pakistan provides China with the China–Pakistan Economic Corridor (CPEC), which terminates at Gwadar Port. Gwadar Port is China's best point of access to the Indian Ocean by far.
CPEC actually passes through the Pakistan-controlled portion of "disputed" Kashmir: if India were to take all of Kashmir, they would be able to cut CPEC off; plus, they would get a border with Xinjiang. This scenario is almost certainly a strategic dream for the US.
Pakistan's military success wasn't just a win for them against India and a win for China's "military industrial complex".
It was a monumental win for China against US containment efforts - China has fended off what seemed like a desperate attempt by US/India. Moreover they've proven that they have the technical and industrial ability to support their partners.
No doubt the US will keep trying, with coups perhaps, but this win drags the US one step closer to having to accept that they aren't going to be able to contain China from the west, which puts the value of the eastern containment strategy in question.
On a slight tangent, the US has also tried to control other Central Asian countries in order to contain China - e.g., Russia had to intervene in Kyrgyzstan in 2010 over an attempted coup. Russia had to intervene in a coup attempt in Kazakhstan in 2022 too. These are just two of many recent coup attempts in the region of late.
We all know which country is the most prolific coup instigator.
The US' moves to undermine these countries seems to be pushing them toward China. Uzbekistan has just ordered J-10Cs from China for instance. Further unrest in the region is highly likely as the US empire's death throes become ever more desperate, let's hope the countries of this region show the same resilience as Pakistan.