Why do Web3 developers need a Crypto Wallet integration API?

As a developer working in the Web3 space, I'm curious to understand the importance of integrating a Crypto Wallet API into my projects. Can you elaborate on why it's crucial for Web3 developers to have this functionality? How does it enhance the user experience and facilitate secure transactions within decentralized applications? Furthermore, what specific benefits does it offer in terms of convenience, scalability, and compatibility with various blockchain networks?