Thanks for getting in touch, and thanks for the feedback! I can see how that wider zoom level would be useful when you have those kinds of long-term projects. We don't have current plans to specifically add the ability to zoom out to a year, but adding additional zoom is something that's been discussed.
I've made a note that it's something you'd like to see in a future version of Forecast and passed it on to the product team. No guarantees, of course, but we do use customer feedback to drive new feature development.
We appreciate you letting us know how we can make Forecast better!