Irrelevant. Aussie greats in the past are still seen as greats today,most of them won a number of Aussie open titles. Skipping AO wasnt really the norm tbh, rather a number of big name players skipped them and it was over sensationalized.
Not true that it wasn't the norm at the time to skip it. Top 5 for 1980 and the number of times in their career that they headed to the AO:
Borg - 1/9 years
McEnroe - 5/14 years
Connors - 2/23 years
G. Mayer - 0/9 years
Vilas - 5/18 years
Conversely, when you look at who won the aussie in the late 70's, while Borg and Connors were the equivalent of Federer and Nadal and McEnroe was on the rise... you have a 2 players seen as greats and a group of players who all took it as their only slam. Remember too that the AO was grass for this period. Further, contrary to what you suggest, it wasn't just won by Aussies at this time - just a bunch of players who took their only ever slam win.
75 - Newcombe - 2 AO wins, 7 slams
76 - Edmonson - 1 AO win, only slam win
77 - Tanner - 1 AO win, only slam win
78 - Gerulaitis - 1 AO win, only slam win
79 - Vilas - 2 AO wins, 4 slams
80 - Teacher - 1 AO win, only slam win
81&82 - Kriek - 2 AO wins, only slam wins
AO is a slam, period. If those who skipped it could have won more, then those who won it before, should be much lesser then. That discussion is futile. It is what it is.
Most discussions that don't involve CPR are futile in one way or another, including ultimately every discussion about tennis. When a thread discusses career slam count, I think remembering that history plays a big role here is indeed relevant.
(Not that it's relevant, but I'm an Aussie. I'm well aware that it's a slam. I've been to it more than a dozen times... I just know its place in history started to change in the early 80s, and then changed monumentally in 1988 when it went to hardcourt at the new facilities)