So in barely 30 years Afghanistan will transform into a peaceful, economically prosperous, and basically free society, finally having cast off the yoke of colonialism?

Free? Not so much (19/100 on Freedom House's freedom score): https://freedomhouse.org/countries/freedom-world/scores

Prosperous? They could be doing worse, but $2785 per person per year doesn't overwhelm me with their prosperity: https://data.worldbank.org/indicator/NY.GDP.PCAP.CD

So... nice snark, in a very disingenuous kind of way, but not very related to reality.

Nice websites, but try actually visiting Vietnam, as I have. You’ll encounter a people who are fairly prosperous by regional standards, and downright rich compared to the colonial era. Government involvement in their day to day lives is minimal. I chose my words carefully.

It may not be a huge success story, but it hasn't been a failed state either.