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And Skylake itself wasn't a new design either, but rather a tweak of Haswell (prominent changes were in the uncore), which in turn was largely identical to SB/IB.

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It's been benchmarked that from Sandy Bridge to Kaby Lake the IPC only grew 20% https://www.hardocp.com/article/2017/01/13/kaby_lake_7700k_v... but the power efficiency has brutally increased: This is a 35W CPU in 2011 https://browser.geekbench.com/processors/381 and this is an Y (4.5-7W) CPU from 2017 https://browser.geekbench.com/processors/1822 .

Skylake was a reasonably big core architecture upgrade (a "tock" in Intel terminology). Several new instructions (XSAVE, AVX512, etc.) were introduced. Perhaps you meant Broadwell?

Consumer Skylake and derivatives didn't get AVX512; that's reserved for the server parts that arrived two years later.

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