[bombcar]

There was a "bad spot" around the late 80s through the early 2000s I feel, when houses were just starting to be "improved" for energy efficiency, where some really bad decisions were being made (water barriers that trap water in the walls allowing mold to spread, etc).

Modern building science has raced past those, but not all construction crews are utilizing them; which is sad. Many times there's not an increased cost at all; it's simply correctly using materials.

[nemo44x]

And it also has to be done right. I noticed a small leak in my home that aligned with where a new vent was installed a couple years ago and I went up to confirm my suspicion that the flashing was installed wrong. And it was.

[bombcar]

One of the better advances in recent times have been things that reduce "envelope penetration" because dammed if it is never ever done right apparently, even on brand new construction. Furnaces and water heaters venting via PVC through the wall seems to work out better.

It's the #1 reason I'd hire multiple home inspectors during construction if I ever have a house built.