Someone's missing the point, and it's not me.
Spelling it out, slowly so you get the point:
Mac Pro setup:
1 very large box, with a cable running to the screen and a cable to the mains power
1 screen, with a cable running to the very large box and a cable to the mains power
iMac setup:
1 screen, with a cable to the mains power
if you need PCI cards, you can add:
1 small box, with a cable to the screen and a cable to mains power
The Mac Pro AS A DEFAULT needs to have these external boxes and wires that you hate so much. The iMac works without for 80% of the users, and for those that don't, it's a much smaller external box that can be added.
Hard drive space:
How much storage do people need onboard? Any one doing the level of work that "requires" a Mac Pro is using external storage via a NAS or a file server.
And a 1TB internal is definitely not enough for a scratch disk