Which would be a valid argument if the 74 and 380 didn't carry vastly more payload, so weren't significantly heavier at that ~160 knots. But they do, so they are. Which gets back to aerodynamic efficiency being relative to the objective you're trying to achieve, as you allude to in your T/O discussion.

One of the reasons why a/c of today all look the same is that they are all designed for the same purpose. That is to carry as many bums as possible for the lowest possible unit cost!

Compare Concorde with the VC10 and 747. All of those a/c were designed for different purposes.

Concorde obviously to fly supersonic. The VC10 designed for hot and high altitude airfields. A high performance sub-sonic jet that still holds the Trans Altantic record!

The 747 designed for as many bums as possible as far as possible.

consequently all three a/c appear slightly different in looks!!