> although it could be condensed quite a bit.

I bet I can condense this even more: it's yet another FAANG shibboleth that starts out as a good idea and the evolves into a ritual candidates need to perform until they can identify that they are "in".

Google Algorithm/Whiteboard interview has morphed into a generation of robots that can solve any LC problem but are incapable of building anything real in software.

Currently I think there are more books out there on "passing the systems design interview" than there are on actual systems design.