I have no clue at all why all these halftrack call ins can't atleast be bulletproof. Both 250 call ins and this m3 group. Like come on.
I don't know that this is a problem so long as it is balanced for all sides. It gives SOME defense against small arms but not total defense.
The answer here actually can be "historical". The armor these thinigs had would not stand up to a strainght .30 rifle bullet (but probably would to a 9mm SMG round). Their main benefit was in protection from shrapnel and rounds coming in from angles or range. They can get infantry TO the battle but not fight IN it.
It was this weakness that lead to the use of Kangaroos by the Canadians, since the Roo in theory could go wherever the Sherman could.
This weakness of IFVs has persisted. The M2 Bradley was an attempt to go a next level.... An IFV that could fight off a tank if need be and could survive all but AT fire. But AT fire is too prevalent on the modern battlefield. The US army went to the Stryker, which is also enough to stop all but AT rounds (including making a lot of IEDs survivable by the crew if not the vehicle), but is lighter and many ways better at its role than the Bradley.
I think the only ones who have gone the way of the Kangaroo are the Israelis who have made it possble to configure a main battle tank to carry infantry (but not well) and have converted MBTs into 40-50 ton APCs.
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