Thanks for bringing up these points for the Ryzen setup. The Aorus Master was just a 'same name' board I randomly chose but there are boards that are both Tier A like Aorus Ultra we can substitute in just for discussions sake. Note there is roughly $70 difference between X570 and Z390.
Upgradable down the line would be nice, but I suppose for now, given the similarity in prices, a 9900KF would produce much higher frames at 1080p (I use 240hz monitor - mainly for shooters and not AAA titles).