And just for consistency... you can't practically monitor the success of something if it has daily variables. You don't have to follow the plan 100% of the time, but if you don't have an 80% plan you don't know what is and what isn't working.
I prep 5 meals, not 7. And weekends I'll trade up a shake for a family lunch or fry up etc but 80-90% of my week is done to a plan and adjusted as goals are met or tweaked. If you have different meals every day, every meal then has to weighed and counted each day. If you eat similar foods you don't have to figure the maths out, it's all set and you can easily add or take out. Plus you have the digestive efficiency of eating similar foods, so long as you get your variety set within your plan.