Good review, but I think a lot of people are going to be disappointed with the storage space. Sure you can expand it, however the price of the internal expansion card is very high and an external HDD is not ideal either. Combined with the lack of a disc drive has me out. (The X is too thick to fit in my av unit, so that's out as well)
I had enough room to install Valhalla and Dirt 5 on top of those mentioned without maxing out, (and obviously never installed the COD campaign/spec ops). Uninstalled Forza (almost 100GB!) 'cos I want at least a bit of headroom to explore new games.
Yeah storage is a big deal. 6 AAA games is pretty much capacity. A no brainer for enthusiasts to get the SX if expansion by 1TB costs the difference. But I don't think that cap will factor very strongly in the decisions of the Fortnite/Minecraft/Sports game audience this console clearly targets.