We used to kid him, "What day is it Mike, then that means roast beef for dinner, huh?"
His Mom had a seven day menu, the same thing each week. Ham on Monday, Roast Beef on Tuesday, etc., etc., etc. Every day of every week, the same thing.
It's not a bad idea. Easy to shop for, easy to plan, as often as she did it, well, it should be pretty good. No hassle for her, she knew each day what she was going to fix, and, it got a little easier each time, and, no experimenting.
Not a bad idea.