The essential significance of BTC from "0 to 20 million coins":

The first 50% (0→10.5 million) took about 4 years (2009–2012), with high rewards and few participants.

The remaining 50% (10.5 million→21 million) took over 14 years, and the pace has slowed down even more (due to halving + increasing difficulty).

Now, over 95% has been mined, with extremely minimal new supply (about 450 coins per day). Almost all new demand is met through circulating coins in the secondary market → this reinforces the narrative of "digital gold" as a scarce asset.

$BTC Less than 5% remaining will be gradually released over the next century, and the mining economy will fully shift to transaction fees.