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How is this the first time I have heard this? Just golden wisdom that is broadly applicable to so much DIY.

I understand the idea of DIY and self repair, but doing some kind of specialized DIY work will require special tools, domain knowledge, ability to fix things on the go, ability to stay focused after a full week of work etc.

I am not dismissing DIY at all, but YouTube repair channels make it sound so easy but viewers forget making these repair videos is their job while your job is writing software. When you try it out IRL these repairs are always considerably more difficult and nobody talks about shipping cost that makes 5 minute replacements considerably more expensive.

I don't know it, and searching got me nowhere. Could you expand?

The BOM of a DIY refrigerator (or anything of this sort), built using retail price components, is almost as much as a manufactured fridge that was built using components bought at a volume discount.