I'd argue its blatant foolishness and ignorance.
The fact all the Riverland is primarily planted with Shiraz, Cabernet, Merlot, Chardonnay and Sauv Blanc instead of Nero, Assyrtiko, Monte, Temp etc shows how dumb we are.
Shiraz in the Barossa aside (as its now a 'style' thing), why people don't drink more mataro, grenache etc is insanity. We drink sub par pinot at $20 instead of grenache for the same price which is twice the quality.
We drink merlot from everywhere we shouldn't instead of mataro from Barossa. It's just an industry being driven by retailers who have no f**king clue about how to strengthen the agricultural foundations that are in desperate need for change to survive, especially with climate change.
Maaaaan I think it's such a Pandora's box question in a way because it goes ultimately to the core of the wine industry. Which is that, IMO, until very recently the whole industry has essentially been a conservative, change averse bunch of old folks making wine basically for themselves. Locals love their own regions, but otherwise it's the same juice wherever you go.
You and I and SGL and anyone else who's ever worked in the industry know exactly what I mean. It's the old bloke who comes in wanting a shiraz, but actually meaning he wants nothing except Pepperjack. Because "shiraz" is only high ABV fruit syrup from the Barossa and anything else is "rough". Cab sav is overcooked mint and black currant jam from SA as well. Merlot is fruit water that's prized for having no character. Only red wines that are "smooth" are worth drinking.
For a long time the majority of wine drinkers were this bloke, IMO, and the industry grew up around them. Even our generation who have grown up leaning more into wine are stuck with the beliefs of our parents. The best thing a wine can be is big and smooth (meaningless terms). And then when we went into the US market, f**ken Yellowtail and Rosemount were the world beaters and set the tone for our export industry.
I've been out for a long time now obviously, but I guarantee the same reds especially are near the top of the tree once you get out of the base level. Saltram/Pepperjack shiraz, Taylors shiraz, anything Penfolds, Wynns Estate CSM, Grant Burge, Wirra Wirra Church Block, etc etc. There'll be some decent wines in the list, but they're all very old fashioned.
And once you get outside Australia, if you don't think French wine is the benchmark in all cases you're not a true wine snob. Granted it can be in many, but the attachment to the past is so strong. Personally I'd go to a Super Tuscan over most Bourdeaux...
I won't write an essay, although I could lol...but FFS saperavi is still badged as an alternative variety even though it's literally the original red wine as far as written history goes goes. I do have hope thanks to younger drinkers though, because wine is cool again and when things are cool change happens. People actively seek out points of difference because stuffy old fruit jam from Pepperjack is not cool. It's grandads wine, and no one wants that unironically.