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Because it means that valid code that compilers might generate for v2.3 and latter of the spec will trigger an illegal instruction trap on the processors that implemented the old version of the spec correctly.
The other direction (changing it from legal to reserved) would be less problematic, since that would just mean that older cores implement an instruction that newer compilers will never generate.
Also: People are telling me we have not enough reserved compressed encoding space for XBitmanip c.not, c.neg, c.brev instructions (which would take up 24 reserved code points in the encoding space). This change just threw away 64 reserved code points for nothing.
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