and to add another voice to the Hatchet vs Kick debate ....
One thing I don't think I saw in this thread was comparing 'firing arcs'
* A Kick can hit a target in one of the three hexes in 'front' of the 'Mech (not counting Quads in this example)
* With Torso Twist, a Hatchet can hit a target in any of the six hexes around a 'Mech
Now, that may not seem like a important thing, and in game it may not stop people getting into to the rear of a Berserker with a lighter 'Mech and Kick to force a PSR (I have fond memories of having a Locust do that and knock over an Atlas

),
but in-universe, there would be a BIG difference between getting behind an 100 ton Assault 'Mech and kicking when you know it has little chance of getting a physical attack on you vs getting behind a Berserker and watching it torso twist and swing a 7 ton Hatchet at you

.
Then there is the fact that when trying to Kick you have to manoeuvre to get your target in your 'front' three hexes. To use the Hatchet you just need to be next to your target

.