The whole house thing is always what throws me.

How often do you want the same music (or sound) in every room? Or even multiple. I wire room by room. If it has a sound system it has a source. I've never needed to have the same music playing in the bedroom as the office, living room or kitchen.

Maybe I'm just old .. but I did mention the above in order.
The workout room is wired (to its own system) the living room is wired (to its own system) the office is wired (to its owned system).

I wire for sound, but have have never seen a need to wire for a 'whole house' sound system.
And yes, an extra conduit is a great idea. Future proof. Even if you wire for today, technology changes tomorrow.
I wish I'd run some HDMI and USB cables that I didn't. But with an extra conduit I still might be able to.

Wireless is convenient, but doesn't cover everything and likely never will.

I do not work here, but the benefits are still awesome
Make your sound your own!