The lead settings have an option to require validation for converted leads. If this option is unchecked, then the Account validation rules will not be enforced when a lead is converted to an Account. This could result in missing or incorrect information on the Account records

The app builder should use Web-to-Case to enable visitors to the website to open cases. Web-to-Case is a feature that allows users to create an HTML form that can be embedded into a public-facing website. When visitors fill out and submit the form, a new case is automatically created in Salesforce with the information from the form fields. Web-to-Case can also assign cases to queues or users based on predefined rules and criteria. Outbound message is not a valid tool, as it does not enable visitors to open cases. An outbound message is a type of workflow action that sends a secure XML message to a designated endpoint URL when a record meets certain criteria. An outbound message can be used to integrate Salesforce with external systems or applications. Screen flow is not a valid tool, as it does not enable visitors to open cases from a public-facing website. A screen flow is a type of flow that allows users to create an interactive guided process that can collect, display, and update data from multiple objects within Salesforce. A screen flow can be embedded into Lightning pages or Visualforce pages, but it cannot be exposed to unauthenticated users on a public website. Email-to-Case is not a valid tool, as it does not enable visitors to open cases from a website. Email-to-Case is a feature that allows users to create cases from email messages sent to a specific email address. Email-to-Case can also capture email attachments and thread information and associate them with the case.

Before replacing workflow rules and Apex triggers with Process Builders, the app builder should consider avoiding generating infinite loops and combining actions when possible. Infinite loops can occur when a process updates a record that causes another process to run on the same record, and so on. Combining actions can reduce the number of processes and improve performance and maintainability