Default Formatting Templates don't add "required" to input tag

I’ve just started using FreeForm and so far it’s fantastic after moving away from another solution.

One thing I’m struggling with is how the "required" option works for fields. I would have expected it to add a required attribute to the input field, but all it does is add a required class to the label of that input.

I know I can add the required attribute myself and that’s what I’m doing now but wanted to check I’m not doing something wrong? The formatting template I’m using is Bootstrap 4 and I can see it only uses required in relation to labels.