Rewiring the wire-wrap backplane of a (in comparison) low-power computing system from 60 years ago with just a wire wrapping tool and wire with only 2 steps is

Rewiring the wire-wrap backplane of a (in comparison) low-power computing system from 60 years ago with just a wire wrapping tool and wire with only 2 steps is 'extremely simple' if we were to use your measurement of tools, steps and material, yet I doubt anyone replacing their phone batteries could do that... It's all relative.