How about making grenadiers with 5men just as strong as 4 man squads instead?
You can adjust health, armour, weapon strength etc to create a 5 man squad with exactly the same stats as a 4man squad without any problems. All you just need a tiny bit of maths. It's a matter of a few minutes to code something like this.
I think the main point of refuting arguments is that adding another man will have an adverse impact on other balance aspects of the game - snipers in particular.
"If it's not broken, don't fix it"
While squad wipes are definitely more prevalent as a German player, this issue can be better remedied with improved squad AI and collision detection. It could also be a l2p issue.