"Also you added lots of custom code which a beginner might not understand and it would not be good practice to just copy and paste the code without actually knowing what it all does and how to write it."
Agreed. But at the same time its key to understand how webpack and babel works
"Plus creating this setup every-time you want to start a project is just going to add more time and of course you are not going to do this during an interview"
You don't have to do this every time. That's why we use executable JS file and bin property to bootstrap react app with single command just like CRA.
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"Also you added lots of custom code which a beginner might not understand and it would not be good practice to just copy and paste the code without actually knowing what it all does and how to write it."
Agreed. But at the same time its key to understand how webpack and babel works
"Plus creating this setup every-time you want to start a project is just going to add more time and of course you are not going to do this during an interview"
You don't have to do this every time. That's why we use executable JS file and bin property to bootstrap react app with single command just like CRA.