The previous method involved adding each checkbox as a field, and then all of the extra code we needed to handle multiple fields as one both for storing the data, handling user updates, and also in emailing admin notifications.
But 2.9 allows us to filter the rows directly in the array of rows and insert the extra html we need for this. That means you only need to create one field in the fields manager which makes handling the data much easier on the backend. I’ve even made the code snippets nearly cut-and-paste. In most cases, you should only need to specify the name for the checkbox group and the labels/checked values.