[Q] WHY isn't it possible to unlock some locked bootloaders?

My appologies if this has been asked before. I spent well over ten minutes googling and searching this site.. I'm new to custom ROMs so I may not be phrasing my search queries optimally.

Why isn't it possible to unlock a locked bootloader that "can't be unlocked"?

From my understanding, the bootloader loads the kernel into memory. Something else bootloader-agnostic loads the bootloader into memory (phone's equivalent of BIOS?).

(This is applicable to many more devices than the i535, but for context
I've done some reading for the i535 (Verizon S3) which states that after one has taken the 4.3 OTA, there is no flashing the bootloader (the upgraded ODIN won't allow it).

However, one can successfully root after 4.3.

So this gets me thinking...it was a software change which disabled the ability to flash the bootloader...Specifically a software update to ODIN. The great part about software is that it can be modified relatively easily (compared with hardware).

I'm curious why it's not possible to, with root privilidges, do a disk dump (dd) to the correct device files, or swap out the ODIN binaries with older versions.

Is it not possible to unlock a locked bootloader that's "not possible to unlock" OR has no one spent adequate time figuring out the solution?

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