Well, veterans will do lots in a day, but it will be conversations, drawings and thinking about exactly what the best thing to do is. They will then spend much, much less time programming than someone green who had a React bootstrap and pre-commit rules up before they knew what they were building.

Sure, and that's the way it should be. Understand what the heck we are really supposed to be building.

Otherwise we deliver what the customer asks, while failing to deliver what the customer wants.

True, but also the "how". There are plenty of pitfalls to avoid with a bit of up-front thinking.