Greetings; i gave your OS a spin and i Will defenitly use it on casual family members. For me One thing is a showstopper however.
There are no Open gl vulkan dxvk 32 bit libraries. This means that every gamer that relies on Steam proton or wine via lutris cant play their Windows games apps. I understand that you have many apps but sadly we live on a Windows world and there are no substitutes for PlayStation now that i run for my kid via lutris and this is just one example.
You should have an advanced mode use at your own risk where the system could be unlocked as option só advanced users could install missing libs thru synaptic.
You could add some tweak options for icon style and there should be an option to manually change the webapps icon to a custom icon ; some sites dont have a preselected icon.
You should have the nvidia settings APP available so advanced users can tweak gpu settings.
You should have an advanced partitioning option so people with more then convencional One drive can setup swap file or home dir.
These are small things that can help more users to adopt your OS.
I did loved the way everything worked out of the box and how office was fully configurated to my language preset.
I also loved the Simple way one can make webapps.
Loved the Simple but funcional design.
I do hope you get to a point where i will use your system as my main system one day.