Is there a specific reason for it to be that way? In my opinion is just removing function of the user. Like in my case where my keyboard dont have default Home/End PgUp/PgDn keys.

I've tried to recreate my problem.
So I open a blender file, go into a script workspace since you told me on your note that the behaviour is different in the 3d view port.
I created a text file then i open windows virtual keyboard, i start typing some stuff, and as you can see the normal keys Page Up Home End etc work fine but when i try to use the same keys over in the numpad i get nothing.