Since when did anyone argue against that?

There is a context going on here, Stewart. More-or-less that horns
(may) have inherent problems due to their nature and design. The
question under discussion is how much/well can these (potential)
problems be overcome with modern means-and-methods. And whether the
results so-achieved are worth the effort as compared to other options.

And, from what I understand, one of the major virtues of horns is their
relative efficiency as compared to (more) conventional designs. So,
that is where efficiency became a point of discussion, along with
accuracy.

Peter Wieck
Wyncote, PA