@spikeyxxx
Switch your keymap profile to something else (like Industry Compatible) and notice that the Preferences menu at the top disappears
For some settings like spacebar action, it makes sense that this is default Blender keymap-specific as this can be customised individually on other keymaps, but there are other settings like Extra Shading Pie Menu Items which simply adds extra selections in the Z shading pie menu
Though I did just figure out that the extra shading pie menu can still be achieved in other keymaps by changing the Shading command name to VIEW3D_MT_shading_ex_pie
