Bluefin is complete without being bloated. it has found the right balance for most users. Gnome is minimal and often foregoes bare functionality in their philosophy: it is unusable without a few Gnome Extensions. Luckily, Bluefin provides a couple of extensions to create a usable GUI.
The filemanager, Nautilus, has seen many improvements from its extremely bare-born version a few Gnome versions ago. It still lacks the finishing touches though.
Strangely, these cannot be added via Gnome Extensions. You would expect most end users to be happy with 2 ways of adding capabilities to their computer: Flatpak and Extensions. Unfortunately, for basic Nautilus extensions, the only option is to add that library package via rpm-ostree, which seems a bit overkill to go for layering… just like it wouldn’t make much sense to install a Gnome Extension via layering.
My suggestion would be to add the nautilus-extensions package to the image of Bluefin (or even to uBlue OS base). It’s tiny but adds common functionalities to the filemanager that most users can benefit from if they enable the extensions.