I was ignoring the details on how SRAM works in favour of thinking about it physically. Most of those details just affect the average cell size at the end of th

I was ignoring the details on how SRAM works in favour of thinking about it physically. Most of those details just affect the average cell size at the end of the day. The other physical aspect we’re dealing with is propagation delay and physical distance. That’s where the library analogy really shines: if there’s a minimum size to a book and a minimum size of you (the person doing the research) this corresponds roughly to minimum cell sizes and minimum wire pitch, so you’re ultimately limited in the density you can fit within a given volume.