Great post. The old houses we see today give a skewed presentation, because at least in this relatively old corner of the country, they're the few exceptional examples left standing. I'm presently sitting and typing in the 1775 addition to a 1734 house, and it is very well built, but the dozens of other neighboring homes have been either disassembled, knocked down, rotted out, or burned to the ground. The "common man's house" of the 1770's is nothing you'd want to live in today.
Even having said that, a mason who was here doing a big project two years ago was laughing at some of our stone work and telling me that if one of his guys had laid up our 1775 gable wall, he'd make them disassemble it and do it over.
Also agreed on appliances, the old ones lasted forever. But on the flip side, few want to keep a 40 year old range or refrigerator, when features and styles change more quickly than that. I'd be happy with a 20 year Fridge though, I've gotten 2 - 6 years each, out of the last three kitchen refrigerators.