Infinite grenades?

I just dont understand why this is not a custom game option when you have options like bottomless clip?

When the developers are making bottomless clip do they just forget grenades exist?

Halo 3 only went as far as regenerating grenades which makes maybe a little sense but why no extra option for bottomless and why did reach get rid of it and halo 4 aswell?

To me it feels like one of the most basic custom options even more basic than no sprint option, I dont understand the reasoning behind some of these decisions other than just straight up forgetting about it…

+1 want to practice my 300kph 'nade launch.