I'm familiar with this link that compares flow, process builder, workflow rules and approvals (https://help.salesforce.com/articleView?id=process_which_tool.htm&type=5), but when/how do people choose to use Salesforce Macros (https://help.salesforce.com/articleView?id=macros_def.htm&r=https%3A%2F%2Fwww.google.com%2F&type=5)?