Who said it's 75% reduction?
All grenades have 50% reduction vs heavy cover and NO reduction vs garrison.
This is why riflenades/etc can instakill some garrisoned MG-team members instantly.
If you want to have NO reduction vs heavy cover, there would be no reason to use cover again; ever. The squad formation already punishes you for using cover by making all team-members bunch up (and thus make them a prime target for explosives).
Relic already trialed this between TBF release and the Leigfest patch, and it was a failure for the reasons I outlined.
PS: If you want to insta-gib an MG team that uses cover, you have to flank them first and THEN throw the grenade.
Sorry, I must have misread this comment from Cruzz in his "The More You Know" post.
"Green cover reduces damage from all attacks that aren't flamebased, including grenades and mortars which people tend to consider counters to cover. Whether the -50% damage is applied to a weapon depends on where it was FIRED from rather than on where the attack lands. UPDATE: Except now it only reduces explosive damage by 0 to -25%. "
So is this saying that grenades can do 75 up to 100% damage to a squad in green cover? Because if it is I have nothing to really complain about LOL.