If the iMac is an all-in-one device, why do you want so many ports to connect stuff to it?
Wouldn't that make the iMac an all-in-several devices kind of device?
Wouldn't the devices you connect be just junky additions?
The most pure all-in-one computer would have zero ports.
A power brick is not sad a bad idea, but having ethernet on it is. It makes a messy situation, as if you are going to have ethernet on the brick, then a jack on the monitor casing, and ports on the rear, it would be better and cleaner to have NO ports on the main monitor/cpu or ALL the ports/connection on it.
Personally I'd prefer a mini hub fed from ONE port on the iMac, with a wove cable to match the power cable, with the cable threading through the cut out that already exists on the stand, with the micro hub then in the same colour as the iMac ordered placed on the upstand out of sight from the front, but accessed just by tipping the monitor to reveal all the ports. Its still an all in one, but more accessible, and only if a user didn't want a mini hub there would they change the position to wherever they wanted.
That hub could easily have all the ports/ethernet/headphone jack/card reader etc., all tidy, all accessible.
Failing that keep them all in one place, not decide to stick a headphone jack here, an ethernet connection somewhere else, and other ports elsewhere.
Same with the bezels. See so many arguing over whether it should be white or black, but personally get rid of them altogether by having the case wrap over the monitor edge by 3-4mm, rather than having screens glue on that have to have them unglued to get access. Far better to do that from the back with security screws, and the screen is seamless with the case. You pick the colour of the iMac and that is what you see at the edge of the screen.
If anyone's had to put SSD's into some of the iMacs they will no doubt confirm its a pain in the proverbial, requiring suction caps etc. etc., and sticky tape, rather than the whole CPU and inner works and the monitor being able to be repaired by just opening up the back with screws.