Almost everything you need to know about WiFi is it is time-shared, half-duplex, and is affected even by non-WiFi interference sources (and affected, whether we know about them or not). The other major important thing to note is that it is what the router 'sees' that it adjusts its radios to. Not what some handheld client device 'sees' (regardless of the app used).
For wiring a home/office space, a minimum of 4 runs per location are suggested today. Yes, hardly anyone listens to that advice. Living space (and equipment locations) are not fixed, indefinitely. The way space is utilized (and where the equipment needs to be) is constantly evolving in most homes. Running a few extra wires today will be priceless in the not-so-distant future.