I’m not a dietitian either, but I am followed by one, and their recommendation for me specifically was to try it and report back with a list of what I ate and whether the Master Plan ™ stuck. The lack of variation isn’t ideal, but in my case, as per their rationale, the potential benefits outweigh the downsides because I tend to default to junk food when my culinary life gets too complicated (she isn’t wrong). Granted though, I don’t plan to eat the same thing daily, so for someone who’s literally on repeat every single day or who already has a very healthy diet, I imagine the recommendation would likely change.