Has need for GUID partition crept in even for Snow Leopard

I bought this MBP 5,2 with Mountain Lion installed, but damaged probably by inept erasure or possibly wonky internal HDD
I never wanted 10.8 as I have a lot of important Rosetta/32 bit stuff. I was briefed to totally erase HDD and re-install, which after some difficulty I did using a Snow Leopard disk, & it ran fine for a week or so, when HDD totally failed. I carried on using the MBP while waiting for a new HDD booting from a Super-duper back up external HDD (made on a 2008 15" MBP), an arrangement that also worked well with our other Unibody 15" MBP whereby my wife ran her Queendom from the internal HDD, while I ran mine from the external
I 'restored' the new HDD from this same back-up, but could no longer use either HDD as a start-up disk. So I used original Install disk to try to install 10.6 (which previously hadn't worked at all). This time it stalled with instruction for a GUID partition, which I made in Disk Utility from the DVD. I was then able to complete the clean install which it followed up with instructions to import my data. However it would no longer allow use of the external HDD as a start-up disk.
So the final stage was to do a new Super-duper back up of the external HDD disk. All a little hairy with my last 15 years work at risk.
Can someone explain why the need for the GUID partition has come in (and when)? Is it just so one can install 10.8 later; when I first got the machine a partition seemed to be holding restore data? (but was insisting I sign up and pay up for my own lion)

Niel wrote:
On an Intel Mac, Mac OS X will only install onto a drive partitioned as GUID; this is necessary for setting up Boot Camp and running firmware updates, but not to boot ths OS.
(82429)
So refusing to install may have a different reason from refusing as a start-up? And an external HD acceptable as a start-up with one internal HDD arrangement may not be acceptable with another?
Are HDDs marketed as 'for apple' just pre-partitioned accordingly, but otherwise no different?
If one erases the device as opposed to just a volume by mistake does that mean the partition has to be re-introduced?

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