Originally Posted by Blameless
Things like differences between configurations that aren't necessarily the fault of the OS.
Drivers, for example. If you only update video drivers on your systems, you are using very old drivers for numerous components on the Windows 7 system. Likewise, a number of configuration changes that may be helpful to older OSes may already have been implemented in Windows 8 by default. If I'm using an OS for any significant length of time, it's going to be tweaked to the utmost, so poor default settings become largely irrelevant.
As for saving time, one could easily argue that updating drivers and configuring an OS is a lot faster than a clean install of Windows and learning to use a new UI.
there really isnt much to learn in windows 8. seriously. i just turned 19, and it took me about an hour to convert. iv been following windows 8 very very closely since it was even a rumor. but im also one of those people that love change.
but, as for drivers, i was using the 296.17 nvidia drivers on both OS's, and the same wifi drivers (im using a dual band usb card. by broadcom) as for chipset, and RAID drivers, they are the same driver version. and both OS's were bone stock. nothing changed. no disabled processes, or tweaked registry. (windows 8 services are wonkey to change, not sure what does what yet)
windows 8 may have metro, BUT it was built from the ground up. looking past metro there shines a very stable and good OS.