I disagree, this game throws history out the window and with all the goofy, rare vehicles we already have in game, one grenade change shouldn't "ruin" the experience. If it does then your knowledge of WWII is questionable. I won't argue against putting the Incin-nade on Sturms as then they make better assault infantry and getting a second one at the start of the game is more feasible. I will argue against all "Historical Accuracy" arguments.
I understand that the atmosphere created by the game is rather aiming for a cinematic experience, and not for a total simulation. A simulation would be less interesting, probablly.
However, there is things that are recognized by many. People who do not know such details as the production numbers of certain vehicles will stil recognize iconic items such as the german steel helmet, the typical american 'pineapple' grenades or... the german 'Stielhandgrenade'.
And that is my point. Of course, there is 'goofy, rare' vehicles - but many people wouldn't even recognize them as such, I suppose. It is about generating a cinematic ww2 experience, not a simulation. And there, the Stielhandgrenade actually helps as it is associated with ww2 by many. I would also dislike it if the regular grenade was removed from US Riflemen or UK Infantry Sections. They need such iconic items.
This is only my opinion of course.