I always buy lots of gold bars for all my houses. /s
Dishwasher and an L2 EV charger
Ethernet.
So my counterpoint on this is that in my last house I ran ethernet everywhere but really only needed 3 drops because everything started to use WiFi.
So when I moved into my current house I ran it to only 2 places where I was certain I wanted hardwired, and put WiFi APs at those drops to give good whole house coverage.
One drop to each room is good enough, you can always drop a 4 port switch into a room that needs more.
I agree honestly. I have a hard wire connection at 2 points in my home… Where my work desk is, and in the garage, which is at the complete opposite side of my house as my WiFi router. I have a could devices hardwired on the garage, including an AP, so now the entire property has WiFi. Everything else is WiFi anyway, so why bother running wire everywhere!?
Professionally installed wired networking? The more detailed pre-purchase survey?
A big toilet. I replaced my little ones from the 80’s when I was getting my house ready for sale because my real estate agent told me to. The new ones were so much more comfortable! I wish I had put them in right after moving in rather than right before moving out. Now I have to settle for a little toilet again because my bathroom is small, and it’s not great.