>>64081968
Game creators didn't want AT infantry to be be one-pump chumps with realistic dispo launchers because it would be awkward to have game pieces sat on the table being ignored by the players for the remaining 90% of the game's runtime, so to solve this problem the rulemakers gave infantry the ability to mow down armored units using their rifles.
This was a horrible mistake but BT writers never retcon anything even when they should.