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I really doubt there's much of difference between brands and models. Old tech built by a few OEMs with some plastic molding thrown on and white labeled every which way. Cheaper to just replace the rare failure than to find an entirely different higher quality refrigerator pipeline if the MTBF of those things are measured in years regardless of brand.

It's easy, they have a lot of units with the same appliances and in the basement they have a lot of spares. When one is replaced the broken one is used for parts to repair where possible.

they do but afaik most complexes get deep discounts from purchasing cheaper, high-volume units in bulk from hotpoint or whirlpool (for example) that they wouldn't get from buying more "reliable" models