I'm asking why there should be an effort on the part of the ARS or
FCC to promote (boost, encourage, or push) this single operating mode
(it's
the only mode specifically skill tested)?

....because the communication mode must be subsidized in order to
continue to exist, as many PCTA'rs have admitted "if people aren't
forced to learn it, they won't and it'll disappear"... so you wonder
how they can also question our use of the term "archaic" or "outdated",
saying "have you listened to that half of the band? there's PLENTY
of CW!" .... if that's so, then how could the mode disappear if not
forced upon people?

very contradictory terms, like most PCTA arguments.

"I had to be tested on it, therefore so should YOU!"