Learn what it means to craft something with care.
Ever enjoyed the craftsmanship of a hand-made product? The effort of sourcing the right materials and putting the hours of work in perfecting just one unit is simply valuable to the beholder. Every detail gives its value and it speaks volume of the craftsmen who made it.
In games development, usually no one can solely build a commercial game alone without involving others. But it is important to recognise there is someone that leads the project, perhaps a collective agreement. An agreement that determines what the game would turn out to be; be it the experience of play or the intricacies of the game.
Given that games are essentially "hand-made" (until artificial intelligence takes over the world), there is a certain amount of value that can be augmented and that is the aesthetic design of the game.
Some regards the aesthetics as the experience of play, but the player's experience is actually the by-product of the design. By following design principles for a respected and appreciative response is more important than getting caught up with a taxonomy lists of defining these experiences and then work from there.
If we look abstractly at it's meaning in games design context, we could summarise it as a judgement of something in harmony.
Game's mechanics and visuals are to work together and be consistent no matter its technological capabilities.