The ethernet jack is too big, I wouldn't want a thicker laptop just for that. Just get the ethernet dongle if you need it.
A USB port is also not that thick yet it has been dropped on many recent laptops, although a Thinkpad X1 Carbon shows it is possible to have USB, HDMI etc on a 2lb / 1kg machine.
Lenovo also sells the T480s, those are not substantially thicker (1.6 cm high) and beefier and come with a built-in ethernet (!) port.
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