I use wireless for my printer and Roku boxes. I have 3 PCs and a media server that are connected via Ethernet. I’m on a 150/35 FIOS connection and wouldn’t come close to those speeds with wireless.
It also really helps to be wired if you download videos to the net like Youtube. WiFi often just doesn’t cut it. Too many halts and drop outs.
We also had the house pre-wired for security cameras including a complete security system and intercom between all the main rooms.
It's much easier to do the wiring when the house is built than to try to string it through walls and floors at a later time.
When one considers that the cost is spread over the 30 year mortgage, it is worth doing especially when the house is a two story building.
We also appreciate the security of the wired connection. We are currently receiving cable TV but that will soon go away. In the meantime, we have disabled the Wi-Fi that was built into the cable modem.
I have been legally recording live over the Air for almost 10 years now so we have a huge library of TV series and programs we can watch whenever we want. Our 15 terabyte media server is available through the internet wiring and allows everyone in the house to watch a different program without any interference.