It is super weird to me that PHMINPOSUW only exists in 128-bit regs. Since AVX/AVX2 pretend 256-bit regs are 2 128-bit regs, I would have assumed that all 128-bit ops would be in there for 256-bit registers as just two copies of the 128-bit op, but I guess not??
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From a digital design or mask layout POV could be any number of reasons. Maybe min of 16 16b words breaks timing, fanning to logic couldn't fit, logic changes or optimizations couldn't be fit and a simple doubling (2x16 16b) would break cost because muxes. Only Intel would know
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