Our Kenmore Trio fridge, also from 2004, I've kept alive. I had to replace the freezer fan and the air diverter motor each once. The water valve needs to be replaced every 3-4 years.
We have a GE washer & dryer from 2003 or so. Those too I've managed to keep alive. The washer needs a new timer, for now we just use the permanent press cycle all the time because my wife is patient, a replacement timer is ridiculously overpriced, and I haven't tried to repair the existing timer. :-( The dryer needed a new drive belt at some point, and I've jury-rigged a bearing for it as well.
Last year I had to replace the microswitches in our GE microwave. Fortunately, they've used pretty much exactly the same switches for decades and still do so these are easily available.
Our 2004 Wayne Dalton garage door openers were damaged by lighting a couple years ago. Was able to find the parts I needed to repair them on eBay.
So, I don't know, around my house I've had pretty good luck sourcing parts.
I notice a lot of neighbors don't even bother thinking to call a repair man and just replace appliances when they fail. I wonder how many of these things are actually repairable, but it isn't cost-effective if you can't do it yourself.