conscripts have merge, grenadiers don't - having 4 men german weapon teams (assuming they have the same HP as 3 men weapon teams before patch) would mean that capturing weapons as ostheer will be less effective as it was before (you can't merge, and you only get 3/4 of 80 HP = 60 HP on your team). Slightly buffing the stats of ostheer weapon teams or removing one or two men of soviet weapon teams would have made much more sense with the current mechanics of the game.
I'm pretty sure the health per man didn't change, so the wehrmacht weapon teams have actually more health than before. So, capturing a weapon with 3 men still gives you the same weapon team as before, now you can just reinforce it with one extra guy.