As I said, I’m a fan of WLAN, but it’s certainly a matter of taste.
I currently still live in an apartment, have a high-end Fritzbox, and can literally see how the WLAN signal decreases from the living room, through the kitchen, to the office or bedroom. I had already wondered if they had built lead into the walls here. Now, the WLAN chip in my wife’s notebook is probably not the best either, and so it happens that the connection to the NAS is not really performant. Even when she just wants to open the RAW photos from vacation, it takes ages. On my computer, directly connected with Gbit-LAN to the switch, it goes really fast.
A little story of suffering, but I would definitely consider LAN connections in the most important rooms. Just look at the topic of consoles; many games have 60GB+ and are only offered as downloads now, and I believe the trend will continue in this direction.
From my point of view, it’s about a good combination of LAN and WLAN. At the TV spots, in the office, and the children’s rooms, I would definitely install LAN. Maybe also in the utility room and where other multimedia devices might be placed. The washing machine or the smart fridge can then gladly go onto WLAN.