Isn't large portion of the tracking aspect simple geometry and decrease in cross section are based on sin(angle)? No kind of concentrator can solve this limitat

Isn't large portion of the tracking aspect simple geometry and decrease in cross section are based on sin(angle)? No kind of concentrator can solve this limitation without also increasing dimensions and spacing requirements between panels. Are there any other significant effects causing decresase in solar energy conversion in addition to the losses caused by sin(angle) decrease in cross section area? Something like decrease in light to energy conversion efficiency when light density is bellow certain threshold or increased amount of reflected light based on angle ?