The wildly globe-hopping table of the home cook is a recent, and kinda silly, development. You can get plenty of variety without trying to prepare meals from every continent.
(this goes out the window if it's a major hobby, obviously, but in that case so should complaints about its difficulty/inconvenience, which are entirely self-imposed)
On first use answer some questions that provide information about dietary needs. Drag some sliders around to indicate preferences for simplicity, cost, ,quality, convenience. Some people want beans and rice because they're cheap, some people want fancier meals and care less about price. Some people are cooking for four and want meals that scale well. Some people
Each wee checkbox the meals you want to eat in accordance with your schedule for the upcoming week.
Press go and get a bunch of meals paired with a shopping list
click on the meals to revise as necessary (e.g regenerate on you don't like or mark an item on the list of required items as "I'll source this myself")
Add to cart, press go, wait for brown truck.
Something like that could be a hit with single men and college students.
That's where I see the value. People spend a lot of effort figuring out how to eat a balanced diet while optimizing for low (enough) cost or just close enough. Offloading the work of planning a balanced diet on a weekly level is something many people would pay a small premium for.
Yes, of course you need other groceries beyond the meal kit itself, but that's not the point - the point is that you've paid the meal service to deal with all the boring parts of the process, which often includes the decision-making, so you can just enjoy the cooking and eating.