How often do they actually abolish something vs. rubber stamping their approval? If something is disbanded, how often was it due to a legitimate issue of not b

How often do they actually abolish something vs. rubber stamping their approval? If something is disbanded, how often was it due to a legitimate issue of not being necessary, and how often to satisfy a political grudge, bias, or simple lack of understanding by non-expert politicians? I like this idea in theory, but I'd also like to know more of what the results have been in actual practice because there seem to be multiple failure modes.