That job in Tucson with the old cloth wiring really changed my mind about rewiring whole houses.
I was ready to quote a full rewire on a 1950s bungalow, but after tracing every circuit and finding the insulation was still flexible and the splices were solid, I just added AFCI breakers and a new panel, saving the homeowner about $8,000, so when did 'replace everything' become the only right answer?