I worked for an AASP in the early 00s and I questioned this, considering that previously the logic boards were actually housed behind the display for both PowerPC and Intel models[0]. This does appear to be mostly true[1] (some of the logic board pokes up beyond the chin).
reply0: https://www.ifixit.com/Teardown/iMac+Intel+27-Inch+EMC+2309+...
1: https://www.ifixit.com/Teardown/iMac+M3+24-Inch+Teardown:+Ap...
The white plastic iMacs from the PPC and early Intel era were about four times thicker than the current design. Back then they were putting optical drives and 3.5" hard drives and AC power supplies behind the display; now, it's too thin to fit an Ethernet port. The current set of tradeoffs really doesn't make sense to me, but if you accept the thin design as a constraint the continued existence of the chin is pretty obviously necessary; those older iMacs could have much more easily ditched the chin.
replyThere were serious thermal issues with the late 00's 24" iMacs. I had one that ate 3 hard drives, and then the display in about 6 years.
replyIt'd be interesting if they used that power brick tether to drive the display similar to the Samsung Frame, which takes power and signal from a fiber optic cable that runs really easily in a wall. If they could shuttle Ethernet up the power cord, they could send video signal back, too.
replyPower over fibre?
reply