What is a primary concern when using password managers?

The primary concern when using password managers is indeed that a user must trust that the application storing the passwords is secure and cannot be cracked. This concern arises because password managers store sensitive information, such as passwords and account details, in a centralized location. If this application is not secure, it could be susceptible to vulnerabilities that hackers might exploit.

Users need assurance that the encryption methods employed by the password manager are robust and that the company behind the software maintains a strong security policy. Additionally, because a password manager holds all of your passwords under one master password, if that master password is compromised or if there is a breach in the password manager itself, all your stored credentials could be at risk. Thus, the reliability and security of the password manager are of utmost importance for users.

Other concerns, such as unlimited password storage or immunity to hacking attempts, are not accurate representations of the risks and features associated with password managers. Similarly, the necessity of user input after the initial setup can vary by software, but it does not address the overarching concern regarding the trustworthiness of the application's security measures.