That's not really the point.
Either one does a job properly or one doesn't.
That is true whether the wood used is cheap softwood or select walnut.
The first point is to look at the application and to select a material that one wants to use for it.
Having done that, the next step is to choose the method to produce the shelves.
It's really not that difficult.
There is really no logical connection between whether or not the shelves are for an alcove, the material used and the production method.
The point is to select what is wanted and to use the most effective method to produce an excellent result.
It makes no sense to suggest that because the project is for alcove shelves that rubbish materials and techniques should be used.