1.) IRL soldiers don't 'load' their grenades, then just throw them in an instant at something.
2.) There is a really gamey tactic, that's evolved, where people run around with hand grenades and throw them at the first guy, they see/that starts shooting at them.
I know, because I almost got teamkilled by it, since people already shoot first, then ask, then all of a sudden I see a hand grenade incoming towards my face and not a red, or blue guy throwing it, it was my own squad mate
3.) On maps like Op Ghost Train, where instaproning doesn't really work, since you land on the ground with tons of grass in front of your face, making you unable to see anything.
Here you have players, that once you start suppressing them, they'll isntaprone and in the same moment, you'll get a hand grenade thrown at you.
I still think, Rifleman should have less hand grenades, but until instaproning gets somehow fixed, so you can't use your weapon while slamming your face into mud or rocks, I think, a delay before throwing grenades would at least bring down a bit of the grenade throwing gameyness



Jaymz