If it wasn't for well placed grenades, some missions would be a pain in the ass
Like the "get mah gold" series from BSM, where you spawn against a bunch of banditos and then have to kill them. Problem is - if the enemy squad get a chance to fire at you before you get to cover - it gets messy... SOOoooo... use a grenade or grenade launcher, enemy get shocked, you get your 3-4 seconds to retreat to cover
Also - I'm quite dissapointed about the no gain to skill via such throwing, but I guess game has no way to distinguish between item dropped on ground and grenade thrown somewhere. Pitty. Good news is - BSM allows for some point spending via level system