So far, I've not had to have anything repaired - at all. I haven't even had to change an appliance lightbulb. I just keep the consumables replaced on schedule.
Initially, it was quite expensive. I do think it may be cheaper on the long run.
My place is going on 22 years old with the same gas oven/stove top, built in microwave, and standing washer dryer combo. No repairs needed that I know of and even if they did, they are all standard, whirlpool type appliance with an abundance of cheap parts online. Even the fridge was going strong until we had an internal water leak a few years ago which was easily fixed for $100. We did recently get rid of it for a more efficient model though.
Now that I think about it, the dishwasher was replaced a few years ago. Mostly because we didn't think the old one was cleaning well enough. But the new one was barely $200 all in.
Commerical, high end versions of these appliances would need to last more than my remaining lifespan to pay for themselves.
I don't think much financial argument can be made for spending large amounts of money on regular kitchen appliances for their longevity.
Our 32-year-old home, with original washer/dryer, dishwasher, fridge, and oven were only recently renovated mostly because of aesthetics - not operation. Of those appliances, the dishwasher was the only real dud the last year.
Of course, they're unlikely to know how well an all new model will last, but most manufacturers don't have all new components in a new model.
I bought my current machine secondhand for AU$200. When it fails beyond repair I plan on buying another on from a repairer, so I'll have the opportunity to ask them what parts commonly fail that make machines unrepairable.
There is zero guarantee of spending more to get higher quality and longer life. It takes a lot of research.
You need to be really, really determined to follow the "Buy It For Life" way.