Then your friendly plotoon comissar wouldn't enjoy you recharging you cells by shooting them, espeacially if you miss
150 is still alot, kinda makes you wonder why it is such a looked down on weapon
in fluff of course, I mean even tyranid standard weapons have AP,
and if GW could stick with their fluff, we'd probably be left without plasma, and you know, imperial guard would have so many more possibilities, when it comes to fluff, IG take everything