>>96403183
I think the immense power of a mech also supports immense melee weaponry. Real world melee weapons meant to be carried by humans have always struggled with the need to be light enough to carry and swing for extended periods, which is why warhammers and swords are pretty small compared to fictional examples from, say, Warcraft.
But a tireless machine of glorious steel and hydraulics sneers at human endurance, and can legitimately carry the sort of hand-held kinetic impact weapon that can wreck another mech in one shot without *quite* as severely ruining its mobility.
Also pile bunkers are just cool.