That’s a reason for then not now.
Better question is then why didn’t Germany stick with the old design instead of switching to more “modern” looking grenades?
And the answer is NOT “baseball”. The answer is that they’re too heavy and cumbersome. And the cons outweighs the pros.
Never ever been in a place where people take food that isn’t theirs. I cannot even comprehend it. And if it happened more than once I’d keep my food in a backpack at my desk.
Is it yours? If no don’t touch. Simple as that.