Show me please any "homebrew" project which have been released on time. Even OS4 was ready "when it's done', and there was a known company behind. I think we can leave all developers alone with time schedule.
On the other hand, same thing happens with CloneA for example. Who remember any deadlines? I'm pretty sure we're already passed some with that one too. And? still have to wait, althogh Individual Computers (and The Man behind it) does everything to be successfull at the end.
Amiga world doesn't mean exact timing. you have to live with that.