For me it shows yet another conclusive case that 2nd generation warfare can't withstand 4th generation warfare. And contrary to the statements from the white house and Neo-cons in the media and political establishment, the reason the Afghan government was defeat was because it was using 2nd generation warfare equipment and doctrine from the Americans and British, rather than 3rd generation light maneuver warfare like that of the Rhodesians in the Bush war. The emotional will of hundreds of thousands of people not to be put to death by the Taliban isn't why they lost. The reason they lost and were put to death is because of the US producing 300,000 2nd generation warfare troops, with state of the art aircraft and vehicles. They had the wrong people in charge of their nation, they had the wrong doctrine, they had the wrong equipment, all from the American government and the neo-cons.
In every engagement the 2nd generation warfare neo-cons have been defeated and failed to understand why, then they give this 2nd generation warfare to their allies and they are defeated, then they say the allies didn't have the will. No the allies didn't have the strategic depth to run away back to America, they had to stay and be defeated.
Rather than having 300,000 heavy infantry, in vehicles, heavy helicopters and air-to-ground fighter bombers. What the Afghan's needed was 50,000 light infantry, trained in light maneuver warfare, operate on their own and take the initiative. Not a top down command which the US put in place. Then you have light transport aircraft, light attack aircraft (like the Hawker Hurricane), light-artillery, light-helicopters, light-vehicles like bikes, motor-bikes and quad-bikes. You aim to emotionally and mentally defeat the Taliban with kindness and decency. You allow them to surrender and return to their families well fed, you don't torture them in prisons and never allow their families to see them or blow them up with drones. You don't have fixed bases for them to target, you have mobile bases which you don't tell anyone about. You wait for the Taliban to attack a farm/town/village then you send in fire force teams, to encircle them and allow them to retreat or surrender. You kill as few of them as possible. This is how you defeat the Taliban, how you improve the lives of people in Afghanistan and create a successful military. I don't believe any of this would have worked in the end because the US was an imperialist force, with a puppet government, however the defeat to the Taliban would have taken much longer and the US/UK wouldn't have spent billions on a useless military of their own design.