Skylake, according to rumors, is absolutely infested with bugs. True or not, an ex-Intel engineer said the number of bugs actually tipped Apple over the edge [1], and I personally suspect that Windows 11 requiring Intel 8th Gen could, partially, be a move against having to maintain Skylake compatibility (or at least a move against claiming that it is "supported"). See also macOS 13 cutting off Skylake support for a minimum of Kaby Lake (2017 and newer) [3]. See also Windows 7 announcing in 2017 they would not be adding Skylake support because it was too much work [4].

[1] https://www.pcgamer.com/intel-skylake-why-apple-left/

[2] https://www.google.com/search?client=safari&rls=en&q=skylake...

[3] https://support.apple.com/en-us/HT213264

[4] https://www.computerworld.com/article/3025399/microsoft-wont...