raid-1 without marking partition as type "fd"

Hi,

I am following rootraiddoc.97.html  howto and it suggests creating an 
"fd" (RAID) parition. I didn't do this and I still have a working raid-1 
bootable partition. I left the both partitions are regular "linux" and 
everything seems to work fine.
Isn't this a better approach than marking it "fd"? This way I can take 
one of the disks to a machine that knows nothing about raid and still 
read data. I know this might work only with raid-1. Am I missing something?

Any help is appreciated
--
Hari