This is a slight rephrase of a topic in another forum that will most likely be buried, but in the other halo games there is a feature Halo Infinite currently lacks, you could hold the zoom button to scope until you let go to scope out. This is different however to the “hold for zoom” setting. Since this feature allowed you to click zoom your sniper to the first zoom level then you could “hold and release whenever” to cycle between mid to high to mid zooms without un-scoping. Or of course quickly scope and un-scope, all your choice.
Situational but rewards a skilled hand and miss it already. Since cycling both modes slows down shots just from the academy drill tests. Since that area actually feels like quick scopes are what it wants you to do there, haha.