Saw a barber on YouTube talking about this exact thing, how going cordless shaved like ten minutes off each fade just from not fighting the cord. That freedom to spin around the chair without thinking makes total sense. I remember @max415 talking about battery life with his gear, and it seems like that's the real make or break. My buddy's cordless clippers died halfway through a skin fade last week and he had to finish with shears, total nightmare. You really need that reliable power all day.

A steady hand is a skill you can build, and it's faster than fixing tape bleed later.

That's a good wake-up call... makes you wonder what other small details we're all missing. Did she point out a specific spot that was the worst, like around a window or the meter? Sometimes a customer's complaint is super vague and you have to figure out the real problem yourself.