Earlier quoted context omitted.
I wouldn't call it easy, but it's conceptually simple to cut a square hole in some drywall to access behind it, and then pop the piece back in with screws, mud, and tape, then paint.
For sure. I've wired my old house with speakers in every ceiling, and cat-6 in every room. I've had a small pipe burst and a couple leaks behind a bathroom. I've patched quite a bit of drywall, and I'm about mediocre at it. But it seems so silly and unnecessary to me. Everything else in this world that requires maintenance comes with access panels and other means of easy access. In our living spaces, some of which sh…
Just make the house itself ~10% larger than it would be otherwise, so the usable floorspace is the same.
Adding/repairing wiring and plumbing would be easy. Every wall could have two layers of thermal/sound insulation. And who doesn't love secret passages?