Some people were never taught how to cook. Some people have messy room mates leaving the kitchen nearly unusable. Some people work unexpected overtime and have their shift run longer and into another meal time. Some people struggle to find the time to cook and clean up for themselves.
The only way I manage to eat decent throughout the weekdays is by doing lunch and dinner prep during my sundays. Its takes a lot of planning sometimes to ensure i have enough ingredients and i often don't get to recreate as much as id like on my weekends.