Well the big issue is that in practice people and especially programmer suck a communicating, especially at the borders. If two people work in parallel to build

Well the big issue is that in practice people and especially programmer suck a communicating, especially at the borders. If two people work in parallel to build one thing the issue is that both people need to know how the connection works before starting. A fullstack engineer typically is going to be as good as both the frontend and backend engineer with the benefit of the entire context of the project. I don't know why' you be an either when if you had just learned both you can always work in a company that silos people off. Even though I've always seen it as way less effective.