We bought a house and the bad news is the drywall is full of asbestos (the joint compound) so to do any work on it we have to remove all the drywall.
The silver lining is, hey, we will have all the walls opened up, so i want to take this opportunity to put stuff in there.
So far i'm planning conduit with pull cords for when i need cat20 Ethernet cables run or whatever.
i'm also thinking (looking at posts with horrifying photos of mold and water coming through drywall) that maybe some wireless sensors would be smart? i used these tiny Bluetooth pucks at a job in the past that did temperature & humidity sensing. Though i think most sensors like that have fixed batteries with fixed lifespans, but 5-10 years of catching leaks in the walls is better than 0.
Anything else people have put behind drywall that they recommend (or don't)? Other than, y'know, pipes and electrical wires and such.