Due to the confines of ogcd being abilities and not weaponskills i agree, but only in that context. Gauss wasn't a 100% equivalent to drill but they played similar roles diversifying the rotation and not being heat based. Gauss changed for the charge system. Again id argue Drill and AA dont have any depth what so ever and right now "Get to 50 spend heat" is all MCH is and if they remove both sure it would be more boring but would play the same with slightly shorter intervals for heat by like 2 seconds. They dont add much to the kit or perhaps im either undethinking its design but i almost never think about these two during fights and DPS seems to be unwavering