Thats the point of the Combat Beta. They are watching things and have spoke about a weapons change in the future (maybe). They have changed them once already and is really a discussion between the admins. If you look through the Sims news feed you can read up on what they are planning.
Per the Stoukers and other heavy weapons, they are designed to work primarily against facilities and vehicles not against people. Therefore they have been balanced to not do as much damage to people to get people to use the anti-personnel weapons instead.
Ammo was removed because we decided it would be too much effort to micromanage and carry around, etc.
"On two occasions I have been asked,—"Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?" I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question."
- Charles Babbage