That and all the other reasons. The only stick grenades still around in appreciable numbers are anti-armor grenades where the handle has a parachute inside. For normal fragmentation grenades, essentially everyone has moved to non-stick grenades (except the USMC who want to make stick grenades).
Even in WW2, the Germans produced more of the boring looking Model 39 grenades than they did of the iconic and eye catching stick grenades. People notice what they want to notice.
That and all the other reasons. The only stick grenades still around in appreciable numbers are anti-armor grenades where the handle has a parachute inside. For normal fragmentation grenades, essentially everyone has moved to non-stick grenades (except the USMC who want to make stick grenades).
Even in WW2, the Germans produced more of the boring looking Model 39 grenades than they did of the iconic and eye catching stick grenades. People notice what they want to notice.