Delivering small chunks of functionality is much better than waterfall in a major project. Big waterfall projects can spend so long in analysis and design that they get cancelled before they really get started.

The real issue with “Agile” is that short term task level estimates are pointless and inaccurate. You can’t estimate really until you understand the task, know who is doing it, their area of expertise and skill level, and how focused they will be without being pulled into other projects, questions etc.

Delivering regularly without micromanagement, removing scope to shorten deliveries, and providing very high level project estimates make more sense.