Fact 1: It is cheaper to produce 13" 16:9 screen than 15" 4:3, 1,5 times less vertical panel space, same width = more panels per wafer.
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Fact 2: Notebooks with 15" 4:3 screens are the same width as 13" 16:9
Fact 3: 13" 16:9, 16:10 and 3:2 notebooks have good enough keyboard width, same as 66-key desktop compacts like HHKB
Fact 4: 12" 4:3 notebooks had cramped keyboards not everyone finds enjoyable. See: G4 powerbook, Thinkpad x40/x60
Fact 4: Manufacturers can produce and advertise their notebooks as more lightweight compared to older 4:3 models because of above facts
Fact 5: On desktop you are not strained in horizontal plane, uless you have one of those "computer desks" from early 2000's designed for shitty 17" CRTs with CD shelves on each side, therefore it is good to have multiple 4:3 monitors or a single a wide monitor, it can display more windows at the same time.
Fact 6: The vertical size of monitor is limited by user's posture and height. The top edge of monitor must be on the line of eyesight.
Fact 7: Jewish tv series and movies are 16:9 aspect ratio. This aspect was found more "immersive" for theatres compared to old 16mm film. This also applies to hueg home television sets with sole (as in one, uno, ein, not feet) purpose is to show jewish tv shows.
Fact 8: 14, 15 and 17 inch notebooks look crap and aesthetically unpleasing, they sometimes include a numpad (lol who the fuck uses it, like Ms. Burkins from accounting lol) and off-centered trackpad which combined makes their keyboard full trash for typing.
Fact 9: If they don't have a numpad, then enjoy your shitty bezels which are sometimes present on thinmeme 13" craptops to accomodate space for side ports too.
Fact 10: iPads and non-shit android tablets have 4:3 screens with size between 8-13 inches. Perfect for vertical PDF reading with accidental display of gui control elements and consuming jewish websites stuffed with ads
Fact 11: Some companies know their shit and offer 3:2 laptops which makes great trade-off between 4:3 and 16:9, but they charge more than usual chink craptop manufacturers do.
Fact 12: There is difference between 3 kg and 1,5 kg laptops, and there is difference between 1,5kg and 800g laptops too.
Fact 13: Volumetric size matters too. You can put more useful stuff in toyr backpack without wasting space on 50% bigger 10% more powerful notebook.