Microsoft's obsession with the C: drive

I did a clean install of beta2.

i have xpp installed on c: drive.

vista on the second partition of my primary drive.

during setup i partitioned and formatted the D: partition. expecting vista
to be installed to the D drive.

but after setup vista is on a c: partition. and it shows XPP on D: and i
think you can't change the drive letters of a system or boot partition.

if I boot into XP it is on the c: and it shows vista on E:

hope this is will be resolved before RTM.

no biggie, but it would be nice if I could keep the same drive letters for
the same partitions\drives in different OS's.

or even better if you had the option to select a drive letter for each drive
including CD\ DVD devices during Windows setup

i.e.

HDD0 Partition0 = C:
DVD = D:
HDD0 Partition1 = V:
DVD-RW = W:
HDD1 Partition 0 = X:



I don't need to hear that this is by design, or to use 3rd party
partitioning software...

What is Microsoft's obsession with the C: drive?