I can understand your point as a user of CodeCity, who would like to have as many features as soon as possible.
From my point of view, I do not necessarily care about the final version of CodeCity or how long it takes me to get there.
I actually enjoy the journey and take my time working on CodeCity, so a merge is not something I am interested in.
What you could be interested in is that Alex Bergel told me they have a project to implement CodeCity in Roassal3D, which will most probably happen at a faster rate than mine.
Cheers
Ricky