I always assume that EVERYTHING leaks! That way I'm never disappointed, only pleasantly surprised.
One of the big plusses of designing our own place (we did it once before) is that we can put our heads together with the architect and do sensible planning for HVAC and plumbing. E.g., our old house had one wet wall, the kitchen and the bath were back-to-back, and we left the sheetrock off that wall in the laundry room down in the basement.
This was very handy when the contractor left the water on during a hard freeze before we moved in . . . . very easy to fix!
I always assume that I am building for 100 years, and for at least 20 of those years, the building will be owned by a complete moron who never fixes anything. I think this pretty much sums up the situation of every old building I have ever had the "pleasure" of working with.
If you are building for 20 years, engineered wood is a safe bet. If you are building for 100 years, less so.