Windows 7 and before it simply asked what OS / option you would like to boot into and then it would do so.
In Windows 8, it boots into Windows 8 and then shows you the boot selection or options and if you select any one of these it reboots the whole machine to get into it.
So let's say I wanted to boot into 7. I start my machine up and it boots Windows 8. It then shows gives me the screen to select my OS since the new boot selector is a Windows program that runs after the OS is fully booted and started. I select Windows 7. It'll the reboot the whole machine POSTing again and everything and then finally loading Windows 7. So for those who will dual boot you now have to load 2 operating systems. Gives a whole new meaning to the phrase "dual-booting".
It's the same with WinRE too. It boots 8 as before, before giving you the option to open CMD or troubleshooting options. Now surely I'm not the only one who can see that this is just beyond moronic.
What happens if the OS won't boot? WinRE is no longer accessible as well. I wouldn't be able to do anything.
Once again those dumbasses at Microsoft have to fucking shortcut the fuck out of everything just to get something working or looking nice on the surface.
Since the boot loader reads from the disk, surely it can have a way to load the graphics driver before Windows is initialized right? Hell Windows PE can do it while Windows is still installing and get a native resolution.