> For one, not enough photos of infrastructure before putting up the insulation and drywall.
We took photos of all our walls and ceilings pre-drywall when we built in 1999, and have referred to them so very many times in the years since. It's great not only to know where wiring is, but plumbing, studs, which way joists run, and more.
Just do it.
Like others have mentioned, we ran conduit from basement to top floor to enable easily changing wires. We pulled ethernet cables, speaker wire for in-wall speakers, 4-wire phone cable for an IR repeater system (maybe not as necessary now, but we still use it), TV cable, video cable...some of these to allow the AV components to reside in a different room from the television.
In the years since, we've pulled lots more ethernet, speaker wire, HDMI, etc., often to locations to which we hadn't run conduit. And yeah, those photos were invaluable.
Enjoy!