Aswell as rearming a plane would take more than 15 seconds, but you can reload a Su25T full of rockets in 20 seconds, while in real life would take more than that, for the simply reason that bringing the payload from the place were they have it, till the plane would take around 15 mins.
Let's be honest, i love DCS, and it's a really Good simulator, but we cannot try to sim everything, because then, we would have to die each time that we get shot down xD.
I just want to fly without breaking my neck in VR, and enjoy such a nice helo, and i don't think is such a big work to do, it could be introduced as a button, like when you press right shift + P and the pilot appears/dissapears, they could do the same but with the gunsight, I don't really think thats "not posible" IMO