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In the case I was thinking of, Skylake-X, the HEDT line, that wasn't entirely true. I was looking mostly at something like Broadwell-E vs Skylake-X, where the difference is huge:

Core i7-6950X - $1,700 at launch in 05-2016: 10 × 256 KiB of L2, with 25 MiB of L3. Core i9-7960X - $1,700 at launch in 09-2017: 16 x 1024 KiB of L2, with 22 MiB of L3.

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i7-6950X: 256 KiB L2/core, 2.5 MiB L3/core

i9-7960X: 1024 KiB L2/core, 1.375 MiB L3/core

Seems to be exactly what I described? L2/core went up by 768 KiB, L3/core went down by 1.125 MiB.

L3 went down per core, but total L3 only fell by 3 MiB. While total L2 flew up from 2.5 MiB to 16 MiB in a single generation for two processors that target the same segment at the same price.

Per core you're correct, but I was looking at net cache available, as that had been remaining static, usually just seeing an extra 256 KiB of L2 per core with little L3 change.

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