These brushes are used for different different use. As makeup involves many type of activities which are not performed using single brush.
For highlighting there is differt type of brush required which must be flat and easy handling and for finishing brooming heavy brush is required and for eyemakeup thin brushes are used , we might can do all this by single brush but after doing makeup it look patchy and over as well but by applying all makeup with recommend brushes it look shiny and attractive as well.
Therefore kindly take this its very helpful??