Do you know how to terminate Cat6a? Your questions lead me to believe not. And yes, if you want a "real" cable plant to meet spec, each component needs to be rated to that spec. In a standard home?
My MacBook pulled down 800+ Mbps on speed tests, but the smart TV I'd hardwired in my great room couldn't break 90 Mbps no matter what I tried. I spent weeks convinced the TV had a crappy network ...