No it's not stale mate, not from past year or so, Taliban is winning. You want me to cite some source I will ask you to read first hand reporting of reporters serving there, not stupid reports but actual ones, exposing the stupidity of US, lies of Pakistan and number of deaths, daily. Afghanistan is losing 1,000+ soldiers per month from quite many months. I read it in next few hours when a district falls to Taliban or they inflict heavy damage or Afghanistan forces joined Taliban cuz they were waiting for help from 3 days and nobody came. If you follow the daily news you will know the actual situation and right now it's very bad, infact very very bad.Right now the Afghan state is in retreat but does construe the Taliban is winning? See what I mean, it's a stalemate with the pendulum swinging .
Why haven't they quit? Don't you think there's a huge tussle within the strategic community in the US, the various arms of the US govt over whether to quit or stay, about the degree of the depth of involvement in Afghanistan, etc? If not, wouldn't they have quit as they did from Iraq?
They just want to quit but don't want to leave. Trump want it a shining achievement in his Resume that he ended Afghanistan war, doesn't matter how. They will still be here and in good numbers and US soldiers will still die but just for sake of name and convention they want to end "WAR", conflict will go on.
We do share border with Afghanistan but it's illegally occupied by Pakistan. That's not propaganda but technically and morally correct statement. We are stake holder in Afghanistan but not really a player. The party we supported was gravely incompetent, even after being in power they just couldn't strengthen themselves.since we don't share a land border with Afghanistan but we definitely are players and stake holders in the Af Pak region.