FT232R chip supply capacitors location
The various size, style and values of capacitors shown are selected because of the advantages of each type. 

Normally the smaller non-polarized capacitor will have better performance at high frequencies. 

The larger valued capacitors that are polarized will have ability to work at lower frequency and smooth larger current flows at those frequencies. 

Note also that one capacitor is isolated from the others via a ferrite bead so there is not a direct combination possible anyway. 

So as you can see there is a disadvantage to combine all the values to a single capacitor.