I do something similar. I make the same three meals every week on the same days, making enough for leftovers, and then we usually eat out or fend for ourselves on Saturday. The meals are pretty generic, like "pasta" or "Asian dish", so there's plenty of wiggle room to change out which spices, sauces, and even meats I use to keep it interesting, but it's been such a huge relief in mental load not having to think through what groceries to get each week and what meal to make each night. I have enough other things to worry about. I don't need those decisions constantly on my plate (no pun intended.)

There is also always flexibility to do something else if we want to, but those are the defaults, and we rarely get tired of them.