I don't need a numeric keypad, but I don't understand why they don't put one extra column of keys on the right with home, end, page up, and page down. There's a huge amount of unused space over there. Asus, HP, MSI, and probably others have done this (though unfortunately they don't all put the keys in the same order). It doesn't have to mess up the symmetry of the main keyboard.
I think the latest XPS 13 added page up and page down above the left and right arrow keys, which is terrible placement (page up should obviously be above page down), but at least they're there. I don't think they added them to the XPS 15.
As a bonus, they could add forward/backward navigation buttons (for browsers). I don't know how many people use those, but I use them.
For my last two laptops, I got numeric keypads just so I'd have extra keys to reassign. It's more keys than I need, and it does push the main keyboard off center, but at least I have the keys.