If you want to make a distro for grandmas, then you should go for it - it just seems like it’s challenging to do right now with where KDE is at. Once the distro differentiates itself more there will be more to say, as of now it’s mostly just KDE vs GNOME - which I think is useful to lay out for non-linux people that stumble across the project.
That is probably better suited for the main ublue page though? Though that and a ranking table of the different focus of the distros on every project page for people to that hit one and are curious about others could work too. I’m sure this is not 100% accurate, but my take on it @ The Linux Cast - Bluefin Long Term Review - #19 by erutan. I love filled spider charts but that might be a bit much. 
You could telegraph how you imagine the distro becoming different from Bluefin (or not) as well. Maybe it is just Bluefin with KDE.