The point is that Network's devices marketing people know that the crowd in general is Ignorant about anything Networking.
On the other-hand people hear the messages of "Buy the new "dumPad" or "dumPhone" etc. because they are 2 core 4 core etc.
So why not using the same "Gig" for networking?
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P.S. 1 - New Tablets and Phones are fine technology. it is the common users Not using their Brain which is capable to even finer work if used properly.
P.S. 2 - Unfortunately there is some contribution also made by the specific Chart on smallnetbuilder.com (WAN LAN) that is often link to by Enthusiasts. It leads the "Ignorants" to assume that its reflect the functional Speed of the LAN Wireless aspect of a Router.