Practice · 2001–now · Web Boom
Agile (as practiced)
Individuals and interactions — then SAFe slideware. The manifesto stuck; the ceremony industrial complex is the fad layer.
Agile mutated delivery culture by legitimizing iteration over Gantt fiction. Then consultants sold certifications until standups became performance art. The values stuck; the branded process gravy train deserved to fail.

Context
The browser ate the desktop
The web became the default delivery surface. LAMP and Rails made shipping cheap; Ajax made pages feel like apps; SOAP/SOA tried to enterprise-ify the wire. REST won by being debuggable with curl. This decade invented the modern product cadence — and the habit of treating every new framework as destiny.