Part of the problem is selling into America - as an American, I can recognize London (smog and Sherlock Holmes!), Paris (Eiffel Tower), Sydney (Seashell Opera House), and New Zealand (Middle Earth).

I can't recognize Brisbane (and visiting it would feel like visiting Bluey).

Producers are SCARED of using unrecognizable areas (and/or for live-action, just film near where everyone is located).

If it makes you feel better, the USA has tons of large cities - far north of 100k, north of 1 million (especially if considering urban areas), that rarely or ever get featured in TV or movies; and if they do, it's often older ones.

Which is sad, mind you. Every city should have its own feel (too many places now feel like suburbs of Los Angeles, even in Europe or Asia), its own beer, its own food, its own media and music.