• What meat do I buy?
• What vegetable goes well with that meat?
• How much of either do I buy?
• What kind of pan or pot do I use?
• What temperature setting do I use?
• Do I use oil or butter? Which kind? How much?
• Seasoning: When and how much?
• When do I put my meat in the pan and when do I take it out?
• Do I have to boil the vegetable first? If yes, how long?

You probably don't think about most of these questions because you already can cook, but someone whose highest culinary achievement is spaghetti with ketchup certainly will.

A lot of these questions get answered by a meal kit service.
And so you learn and gain experience.

Will it make you a great home cook? Probably not, but neither was that the topic of this thread nor did I imply it would.

Regarding waste: A meal kit saves waste, because you have exactly the right amount of food, so no leftovers.
If that diesel truck drives from HelloFresh to my door or to the supermarket (where you have to get it from somehow) is not that impactful imo.

Oh and knife skills? Do you think every dish from a meal kit comes pre cut?