Another device, another piece of clutter, more space used on my shelf, another wall-wart to squeeze into the surge strip...that's why. It may as well be all in one device. It's not just a router, it's a switch as well. When Wi-Fi works as well as a wired connection, then maybe I won't care anymore.
For me, wi-fi does work as well as a wired connection for all intents and purposes. I agree with oneMadRssn on this issue - it's a wireless router.
Sure, the industry standard for a router is 4+ ports, but i haven't used more than 1 or 2 of those ports in years. My computing is all wifi, my printer is wifi. I plug in my desktop simply because it's there - so there you have it. 2 ports, one for the modem, one for the tower... i do have a hardwire running under my house to my media server - but even that works fine over wifi
I don't see how 1 less port increases clutter by 25%. at least not for my purposes. there are a million and one ways to manage wires, switches and general clutter.
i don't think this device or its design are "endgame" but i certainly don't think either are deal breakers either.