It makes a BIG difference when you renovate, I've done that a couple of times in my life. Matching pre-WWII 2x4's - that were actual 2x4's - with modern lumber was a PITA! They'd sell a lot of reducers as people tied 15 & 22mm into 1/2" and 3/4" copper water lines. Same problems matching old drains to new. 1200x2400 mm sheets are 3/4" short for the standard 8' wall as are 50x100x2400 mm framing boards. Sure, simple enough for new housing but with old housing you're dead meat. I don't know where you live but around here (and I'd bet in most of the Midwest at least) there are plenty of pre-WWII houses. Very few old houses are torn down for new subdivisions.
I guess you buy cheapie appliances, then. Our washer/dryer pair is 18 years old, we bought them when we moved into this house in '95. No overhauls or expensive repairs, though we did manage to get a quarter stuck in the interior drain hole, once, and that needed servicing big time because I couldn't figure out what was wrong with it. :-/ The dryer's drive belt needed replacing a few years ago. When we moved in here we were still using my parents old fridge from 1979 making it 24 years old when we replaced it - our daughter used it another year or two after that. My central A/C compressor has a 10 warranty and I expect it to last most likely 20+ years. The furnace has a 20 years warranty and it should last 30+ easy. They call this kind of stuff "durable goods" for a reason, you know - but you do get what you pay for.
The countries that switched late did so when they were rebuilding after WWII. If we get invaded and have to rebuild half our country then it would be a great time to switch. Otherwise, it's going to cost lots of time and some extra money - or a decade of time and lots of money.