Hey Jim,
This really isn’t FUD, I’m baffled. The machine is an iMac 5k with 4ghz processor, 32gb of ram, 512gb ssd, and R9 M295x graphics card.
I’ve reached out to Adobe, no response yet. I’ll make a video of the issues at some point and post them somewhere. When searching, I actually see lots of noise on the web about the issues I run into, so I’m not sure why you say this isn’t a common issue?
For example: https://forums.adobe.com/thread/1626784
That is just on of many unresolved threads about illustrator and the 5k iMac. You can find them for indesign, after effects, and acrobat. Photoshop seems to work great. Adobe even acknowledges that is broken in those threads and has been promising a fix for many months, but it never seems to come.
The point really is that you should be careful with this first gen 5k machine and test it out in your workflow for the 14 day return period in case you lose productivity.