Why computers still need ram to boot?

That was reasonable 20 years ago where the fastest storage media was a diskette but now we have ssd’s and I bet that even oldest sata drives are faster than the old pc100 ram but we still need ram and not just ram but super fast modern ram to solely turn on the pc.

Surely you would ask who would want to run a modern pc at the speed of a pc100 ram? Well, it’s called redundancy and it’s usefull for troubleshooting you know? That’s also why we (used to) have a bios installed under the actual os. If you could boot the pc using only a pendrive it would be far easier to check defective ram or other component, instead of buying new ram just to know if the mobo is fine you could just insert a pendrive and see iif it boots.

Also in a wide way some computers are yet able to boot without ram and are called intelligent devices, which totally discarded ram in favor of ssd, hence why modern pc’s can’t do so just in order to be able to access bios or uefi and change some settings? I’m not telling of playing games on this but be able to use it as an alternate path.

Is this lack of implementation because of lack of physical posibilities or because of tradition and lack of development?