Australia gets a pass for me because it's one of my favorites.

I'm sure if Scotland wasn't designed so British like, we also wouldn't have gotten Gaul, and could have gone to North America. But it's not like Gaul didn't deserve to be in the game either and well Portugal and Byzantium for Europe was expected.
This have many interestingh points like civ gameplay design related to merit and representation.
(This next text is not really directed to you Alexander's Hetaroi, I think you know these points, is just that I used your replay as starting point to shown my thinking on the theme).
There are many regions with millennia of history and numerous urban civ options with different religions, languages, institutions, etc. That despite all these are reduced to one or a couple of representatives that even rotate like if they were just a name for a "same thing" group of cultures. Regions like Mesopotamia, Anatolia, Caucasus, Central Asia, India, China, South East Asia, Mesoamerica, Central Andes, Horn of Africa or the Sahel.
The justification to have just a reduced number is that devs choose the main powers of those regions. So, what with Europe? On the same logic Europe just need the BIG 7 (Greeks, Romans, Spanish, French, English, Germans and Russians) that were not just the big colonial powers but also the regional powers. Of course there was the Norse, Poland, etc. but they are on the shadow of the names of other bigger european powers, like Assyrians are on the shadow of Babylonians name of Purepechas are on the shadow of Aztecs name.
Now we all know that devs need to sell the game, that is by far the main reasons why we have so many european nations, the money is on the western and mainly modern history. Despite all these would be great to remember that when somebody said " X civilization" is usually used on history and archeology to refer to long lasting and broad group (mainly) independent states who shared unique ways of life, institutions, religion, language, etc. Now the game is full of european and their offshoots who are normally referred as countries not civilizations. We can found by far more formal works that talk about the European or Western civilization not the Canadian or Scottish civilization. The Medieval and Modern Europe nations share more between them on terms of culture, religion, language, institutions, economy and dynasties that many others regions that are represented as "the same thing" on game.
That brings us to the on game design problem. There are many forms to represent a civ on game, the design could be good or bad not because how "unique" or "important" is historically that civ, still CIV series have other problem on how symmetrical is the design between any two random civs. We could end with close related protestant european modern nations that ends with a design more unique between them that two totally unrelated civs from any part of worlds history.
Precisely these priority of markets, the lack of regional and temporal context and historicall unrelated design of the symmetric civs is what make people ask for Denmak, Austria and Hawaii, but see as redundant Assyria, Burma, Mixtecapan or Songhai.
Yes Denmak or Austria are different from Norway and Germany, of course are relevant to european history, BUT they are part of the european civilization's history, and have these closely related nations like Norway and Germany already on game. Meanwhile regions like Mesopotamia or Mesoamerica that were for millennia the equivalent of modern Europe of their half of the world are OK with a couple of civs "because they are all the same".