Here is what's Sotoshi Nakamoto want to achieve with a fixed bitcoin supply of 21m. He want become to be scarce asset.
Here's what Satoshi actually said on the matter:
Eventually at most only 21 million coins for 6.8 billion people in the world if it really gets huge.
But don't worry, there are another 6 decimal places that aren't shown, for a total of 8 decimal places internally. It shows 1.00 but internally it's 1.00000000. If there's massive deflation in the future, the software could show more decimal places.
Even if bitcoin became a global currency, he was in favor of sticking to the 21 million cap, and potentially forking to show more decimal places. As I said above, the Lightning Network already deals with milli-satoshi.
1.21m of bitcoin in circulation can be termed as extreme scarcity.
2.30m of bitcoin in circulation can be termed as relative scarcity.
Says who? If 21 million divided among 8 billion people is 0.002625 per person. 30 million divided among 8 billion people is 0.00375. It is impossible to say one is "extremely scarce" and the other is "relatively scarce".