If it had turned into a friendly, America-loving democracy that would tolerate our bases, then it’s an unsinkable aircraft carrier bordering Russia and China. Pretty good real estate.
Supplies are an issue, hence why you don't see the military doing much complaining about letting Bagram go.
China is exerting soft power now by buying up properties and ports in the Caribbean and Latam. Make no mistake, if a real US base had been activated in Afghanistan China, or Russia, would have planted one in Venezuela.