Your mind-reading capabilities aside, most of the top 50 players in the world skipped the Australian Open. You can pretend to know what Ashe was thinking all you like, but the facts belie your arguments. It wasn’t just an Ashe thing.
I was trying to put myself in Ashe's place, to figure out why he would skip the Aussie in 1969, when his usual practice was to go there.
Ashe was not a top 50 player, he was top 5, and he usually went to the Australian.
But that year, Laver was an intimidating presence on the tour, as Laver himself stated. He just had to show up and the other players would get nervous, and try
too hard, and not relax.
The bottom line was that there was no need for any player who was not an Aussie to show up in 1969, it was pretty well a foregone conclusion that Laver had
it, if he wanted it.
Notice that when Laver was not able to show up at the Aussie in 1970, Ashe went there, and won the event.
Any Americans below the top level had no need to attempt the impossible.
It was a concession.