How efficient is wireless electricity compared to wired electricity?
I'm not ecstatic about the following picture shown in the TI document: -



I've drawn a big red square rectangle on the top diagram and it seems TI are saying the efficiency is between two limits: -

Minimum = 0.95 x 0.80 x 0.80 = 60.80%
Maximum = 0.95 x 0.90 x 0.90 = 76.95%

For the wireless diagram they are saying its efficiency is 60% to the equivalent "wired" point but they are neglecting the lower limit so this has a biased feel about it. The lower limit would be: -

Minimum = 0.60 x 0.95 x 0.89 x 0.89 = 45.15%

Read the small print. They say they are using 80% adapter efficiency yet surely a plastic box that plugs into the AC that produces 5V cannot be assumed to have a significantly worse efficiency to a plastic box that produces 19V.