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Had a chat with an old timer about knob and tube wiring

I was on a job last week in an 1890s house and the homeowner wanted to rip out all the old knob and tube. I told him it's a fire hazard, standard advice. But then his 80 year old uncle showed up, retired electrician, and said knob and tube is fine if the insulation isn't cracked and it's not overloaded. He ran it for 50 years without a problem. Now I'm second guessing how quick I am to condemn it. Anyone else had an old timer change your mind on something?
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