I've been following Haiku since it was announced. In that time a couple of personal friends have passed on, and a number of family members. In that time children have been born, gone to school, grown into adults, and had children of their own.
Projects that drag on forever make for an interesting artistic statement, but if their goals in any way include utility then velocity is important because time is important.
For example, I'm a big fan of DOSBox. And while the core project still has some code check-in's from time to time, its last release was 7ya. Now I use and follow forks because they're consistently releasing useful features and fixes.