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There are several problems that can arise when focusing on input using JavaScript, such as:

1. Accessibility issues: If focus is not managed properly, it can create difficulties for users who rely on screen readers or keyboard navigation to navigate through a page.

2. Conflicts with other scripts: If multiple scripts attempt to manipulate focus, it can cause conflicts and unexpected behavior.

3. Performance issues: If focus is constantly being changed in response to user interaction or other events, it can slow down the page or cause other performance issues.

4. Security vulnerabilities: If focus is used improperly, it can create security vulnerabilities such as allowing attackers to inject malicious code or steal user data.

5. Usability issues: If focus is used inappropriately, it can create confusing or frustrating user experiences, such as when focus jumps unexpectedly or is difficult to control.