If people want to go for more features rather than greater simplicity then they are welcome to either customize Ubuntu to do so or use a different flavour of Ubuntu (Kubuntu is the best option if one wants to go heavy on features by default). GNOME is about simplicity, Ubuntu made a few modifications to it just to keep familiarity with Ubuntu Unity (Dock, AppIndicator support, Ambiance then Yaru), otherwise Ubuntu generally has stuck with GNOME defaults upon switching to GNOME; I think going with Nemo over GNOME Files would be too much deviation from GNOME. Like I say, some are rather annoyed at Ubuntu for not going with upstream GNOME more often. I think you need to do more than prove that
to get Nemo as default in Ubuntu rather than Files. I’m not sure what you’d have to do to make the case for it, because just more features is not enough, that’s more KDE’s general philosophy (simple to use, powerful when necessary) rather than GNOME’s anti-feature-creep minimalist philosophy.