Why can't I pin apps, spartan browser and settings on the desktop in windows 10 for pc?

[Windows Central Question]

I asked this question on Microsoft committee also. Not able to pin apps on the start screen is a dumb move by Microsoft. Not being able to pin Spartan on the desktop makes me use chrome and Mozilla more often because I mainly use desktop not the start menu. If this is the case then Spartan and all the other universal apps will be a flop. I don't want to access a app by opening the start menu or from the task bar. Being able to access from desktop is lot more convenient. WHY CAN'T I PIN THEM TO DESKTOP??????