The linked roadmap is for V6 only. We’ll continue to develop roadmaps for future versions as we make progress on development, but it doesn’t make as much sense to guess at when a particular feature will appear far in the future, only to be wrong later. Rigid-flex support is a known feature request, but hasn’t been targeted at a release yet. It’s a big job, and we haven’t even started developing a specification for it.
If we added every new feature request to the V6 roadmap, V6 would never come out 