It's unclear why cache memory is necessary if RAM and cache memory have the same transistor architecture. Can everything be done with a single memory type?

Since both cache and RAM use transistors as their primary building block, it's natural to question why we need two types of volatile memory. This is due to the fact that both cache memory and random access memory are dependent on transistors. Does the computer need many kinds of memory, or can a single type be utilised for everything?

How does pipelining interact with cache memory hierarchy in modern processors?

In light of the fact that transistor-based RAM and cache memory both exist, it's not apparent what the purpose of cache memory is. Does it occur to you that a computer may run on just one kind of memory?