I understand that camera and viewport are important to keep virtual measurement units and handle different aspect ratios and resolutions when building games with worlds bigger than the screen (e.g. side-scrollers / map based games).
I am not sure whether it is the proper way to go for a simple game that fits on the screen entirely - like a puzzle or card game for example.
Is it still better to use camera and viewport in this case, or is it more simple, effective (and hence better) to use directly screen absolute coordinates for these types of games?
Or to put it in other way - what are the advantages to use camera and viewport for games that fit on the screen entirely?