The reason why most projects you see with illuminated buttons use leafswitch buttons is that until recently all translucent buttons were leafswitch style. Only last year did microswitch buttons become widely available largely through the efforts of Shawnzilla from this board (Fx Buttons) and more recently RandyT. However, if you search you will see that tons of projects are utilizing the new microswitch buttons. Another reason could be the lefswitch holder if drilled allowed for great illumination (can't remember who started this NeonMame was the cab), but people have emulated this approach with microswitches. Please note that there were convex microswitch buttons that were translucent, but since they were convex few if anyone used them. Thats the end of the story.