Why do mech games rarely let you leave the cockpit? Brigador Killers devs joke that the feature 'added five years of development time'

I love a mech game, but I especially love when a mech game lets you get out of the cockpit and just run around. It makes things feel so much less gamey, and it more fully sells the scale and power of a mech to contrast it with the perspective of a puny little human. Few games ever do it, though...
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