Why do people still use keys?

Why is it that, despite the advancements in technology and the rise of decentralized finance, people still rely on keys to access their cryptocurrency wallets? Is it simply due to habit, or are there deeper reasons behind this practice? Could it be that keys offer a level of security and control that other methods cannot match? Or is it simply because the infrastructure for alternative methods has not yet been fully developed? It's an interesting question, and one that deserves further exploration in the world of cryptocurrency and finance.