ilvi wrote:
The iMac is supposed to be a DAISY CHAIN, everything you need, all in one cable chain, (exception to network connectivity). Having external adapters, drives, etc was exactly what the iMac fought to deminish.
As Csound1 said, a "daisy chain" is the wrong terminology for this, but you are right that the iMac was originally conceived mostly as a relatively low performance all-in-one ("AIO") consumer-oriented device with very limited external connectivity. (I have owned a lot of them, starting with the old "Five Flavor" CRT model.)
However, over the years we have seen it evolve into something considerably different. They now include high performance CPU's & GPU's, very fast ports, high performance internal busses, multiple radios, sophisticated high power sound systems, very high quality high resolution displays, & so on. In some ways, they are more capable "out of the box" even than far more expensive Mac Pros. Even where they are not, they are now very well suited for many "pro" applications & almost all "prosumer" ones, albeit often with the addition of external peripherals.
All this constantly upgraded performance comes at a cost: it becomes increasingly hard to cram all that stuff into one box without significantly sacrificing reliability. Sure, Apple could build thicker, heavier iMacs & keep adding more complex & noisier cooling systems to keep the guts of the thing from melting down or throttling back everything to prevent that, but is that really what current iMac users want or expect?
As good as Apple is at industrial design, there is no way it can continue to increase the useable performance of the iMac indefinitely without making some compromises in what is included in the case. It just isn't possible to optimize everything in there at the same time. So if you want a built-in high performance optical burner, would you rather Apple throttles the performance of the basic system, adds noisier cooling systems, or what? You can't have it all, so if you were Apple what would you do?
Personally, I'm very happy with my new super-slim iMac. Yeah, I would love to have a built-in burner too, but not if it means sacrificing any of things that make it the most capable iMac made to date.