The hump is not efficient.
The 777 is lower capacity perhaps, but 2 things have closed the gap: the 777 moving to 10-abreast in economy by pretty much all carriers, and the modern seat configuration that carriers are choosing with elaborate low-density first and business seats. Air Canada has 450-seat three class 777, with 60+ more seats than Lufthansa's 3-class queens. There is no longer a need for the 747 to exist.
Nobody is maxing out seating in the current 777 to the extent that the 77X has lower max seating capacity than the 77W it replaces, because why have an extra set of doors when nobody will put those seats in anyway. So Boeing took them out.
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