Bitcoin’s fixed supply of 21 million BTC is often cited as one of its strongest features, but its real impact depends on how it interacts with market demand, usability, and long-term adoption.
Why It’s a Strength

Digital scarcity creates value – Like gold, Bitcoin’s limited supply makes it resistant to inflation, which appeals to investors as a hedge against fiat devaluation.

Predictability and transparency – The issuance schedule (halving every four years) ensures that Bitcoin’s supply is known and cannot be manipulated by governments or central banks.

Decentralized monetary policy – Unlike fiat, which can be printed at will, Bitcoin’s supply cap ensures a level of financial discipline.
Why It Might Be Overrated

Deflationary risks – As Bitcoin becomes scarcer, people might prefer to hold rather than spend it, limiting its function as a currency.

Lost BTC shrink the circulating supply – Estimates suggest millions of BTC are lost permanently, reducing liquidity and potentially making Bitcoin less practical for everyday use.

Dependence on transaction fees for security – Once mining rewards phase out, Bitcoin must rely on fees to incentivize miners, which could lead to higher transaction costs or security concerns.
Conclusion
Bitcoin’s supply cap is a fundamental part of its value proposition, reinforcing its status as a store of value. However, its long-term effectiveness depends on whether Bitcoin can scale for real-world usage while maintaining security and network incentives. Ultimately, supply alone doesn’t determine value—adoption, usability, and market confidence do.