I don't love FIPS either, but cryptosystems don't work the same way as buildings and electrical codes. It's very easy to have "secure cryptosystem A" and "secure cryptosystem B", and then have massive security holes in "cryptosystem A + B". This happens all the time, and is one of the main reasons for the classic "don't roll your own crypto" admonition. The FIPS "whole system" mandate is meant to forestall this failure mode.
Even in building and electrical, just because B is better than A does not mean it’s allowed.
IIRC the first wago parts (221) were UL-listed in 2017, the 221 were released in 2014, and the original push-lever splices (the 222) were released in 2004.
