Have anyone here opened up an iMac to service the insides, or at least blow the dust out of one? I have many times and moving the AC power supply out of the body saves space and heat and collects less dust and causes less dust to become attracted to the innards. Many an iMac has overheated and the power supply weakened over time, so I say moving to an external power supply with or without Ethernet is a plus as long as you don't swing your feet and kick out the magnetically held DC and Ethernet maybe adapter. It's also been my experience that a lot of consumer iMacs only use Wi-Fi, so not including the function won't bother a lot of the intended audience which is the lower of the lower end desktop computers. Higher end will pay for the better 24" iMac and the prosumer will wait for the 30.5" (formerly 27") model to come. While it's true that most external monitors do not use light colored bezels, I agree on this machine it looks better this way and it doesn't really matter to the user, besides not doing it this way for a long time. For the home customer that asks about a new desktop, I think this machine will be excellent, in particular I plan on suggesting buying the model with the VESA mounting studs and getting a desktop clamp which allows for a 90 degree pivot and height and forward/rearward motion. This system would also work for those times when then user would prefer to stand and also free up space directly below for other items. If it wasn't for the power button on the back, a low profile wall mount would be great, but there are plenty of wall mount arms. You may notice there is no up-charge for the VESA version and the less than 10 pound weight allows for a cheap and compact VESA arm. For the curious, I suggest looking at this:
https://www.upliftdesk.com/zilker-single-monitor-arm-by-uplift-desk/ as it includes a quick disconnect feature.