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Wiring mistakes can kill or burn down a house months or years after they have been done. You will not notice unconnected protective earth or badly dimensioned circuit breakers until something else breaks and the protective element is not there.

There are many failure cases that are slow. Especially with water. Let say they sag a bit and connection is poor. It might slowly start leaking over months causing structural damage or at least dampness and microbiological effects.

I'm in the midst of renovating a house at the moment, it's about ten years old.

The plumber siliconed all the shower valves to the fiberglass walls without screwing them to a backplate.

Unsurprisingly the builder is now out of business.

https://structuretech.com/?s=new+construction and the "That Ain't Right" guy https://www.tiktok.com/@gold.star.inspections are enough to tell you that if you're buying new, you want to get there before it's built, from a builder that's been in business for at least a generation, and have your own inspector riding their ass the whole way.