Vehicle Passenger Animations

My friend and I noticed something weird about the Forerunner weapons. While in the passenger seat of a vehicle (say, a Mongoose), the Forerunner weapons and player models are shown to reload with the exact animation that the UNSC weapons have. For example: The Light Rifle reloads like a DMR while in the passenger seat. The Incineration Cannon, which we all know reloads without any handling, reloads like the regular UNSC Rocket Launcher (putting the rocket in the chamber by hand) while on the back of a Mongoose. Was 343i lazy in the development of this small feature?

I noticed this kind of stuff way early (I forge alot so I notice little stuff like this lol)
But here’s some other stuff, when you shoot certain guns like the suppressor, or the DMR, they sound like a different UNSC rifle when reloading.

It’s just something they probably missed during development.