The die shrinks are less than the marketing numbers would make you believe, but the cores are getting significantly more complex. I think E cores had a 50% cache increase this generation, as an example.

The above summary also excludes the GPU, which seems to have gotten the most attention this generation (~+30%, even more in AI workloads).

If you get more space, you need a really good reason not to use that space on more cache.

Also, the size numbers are lies and aren't the actual size of anything.