Basic physics: the more data through the wire, the shorter the attenuation (ie the shorter the cable). In most homes you can still adequately wire the distribution with Cat5e and backbone with Cat6. More importantly, you need to consider simple basic wiring basics (ie do not run over baluns, do not run parallel to electrical, use connectors and patch panels equal to the cabling, consider the health ramifications, plenum where required, no kinks, avoid any electrical interference, hubs/switches worthy of the cable, etc).
The smart home design uses conduit, making it easy to swap out cabling as desired. I know it's more expensive, but look at what you're considering now vs 5 years ago. Tomorrow, might be plastic fiber. A decade from now glass fiber might be the most cost effective solution. We're a capitalistic society trying to convince you what's new is what's best. But do you really 'need' it?