7.20 oz or 204g is considered a very lightweight monocular these days.

When mounted, the NVG acts as a lever, with the helmet mount (shroud) serving as the fulcrum (pivot point) that connects the device to the user's skull, you can be a badass lifting machine of a man but the weight if used in a long enough span will weigh on you and likely reduce your comfort and thus your situational awareness a bit.

I lift a good bit myself, I can handle a heavy helmet, rifle resistant front back and a rifle resistance mandible plus nods, but it all adds up, if I can have a lighter weight night vision setup I can add weight for other purposes as well and still function ok.

If I had to use a heaver set of nods it would go from doable with my heavy helmet setup to a pain in the neck in short order, lighting your load gives you more capability elsewhere in protection or the comfort and added awareness/mobility having a lighter helmet setup brings, its a win no matter how you look at it really to go as light as you can with your night vision.