I've had a 13 ethos for a while now and whenever I pick it up think they must of left something out of it as its so light for the size 520 g
While that weight isn't insignificant it "feels"
very light compared to anything above say 600 g , my 22 nagler at 680 g feels like a lead weight , above that they are all made from depleted uranium imo
maybe the really simple answer is they are bulky and heavier in the wider FOV and longer FL 's because they need to be.
The explores are a good example , you can scratch out a better price point in the 100 fov , but you get 2 full beer cans instead of one