It's all nebulous. No one even agreed on what Web 2.0 meant, it's only in retrospect that we think we know. If we were really sticking to versions being meanin

It's all nebulous. No one even agreed on what Web 2.0 meant, it's only in retrospect that we think we know. If we were really sticking to versions being meaningful we probably should have bumped a version when frontend UI frameworks and javascript began dominating web application development, since best I could tell at the time Web 2.0 was just the addition of flat design and ajax calls.