Then you lose the format of the steps on the right. Try to picture what it would look like if it had you add half the vanilla where it currently is and another half at the “fold in” stage. There’s not a good way to do it.

This design is built around a very simple kind of utilitarian cooking that’s common for institutional kitchens. It’s great for that! But there are a ton of recipes that would be complete trainwrecks if you tried to fit them to this kind of diagram.