Hm, ok, It's still lost on me, and I'm still looking for why it's topic.
My reaction to close range combat in the late game is:
1. Plasma Blade = Dead Alien.
2. Dead trooper!
3. Grenade!
The aliens have devastatingly deadly close range attacks, and are not shy about using them. Truthfully, the Laser Rifle is a far better weapon the the Heavy Laser, the Heavy Laser just out preforms anything at range. On top of that, only on the higher difficulties do aliens have the aim to make use partial weapons at range.
I look at smaller arms, and think "Crud! I have to hug them to use this! So much for this rookie."