Outside wartime, being slow is an advantage. It means citizens can trust rules won’t be changed rapidly, increasing trust in the government. If properly taxes often change citizens wouldn’t know whether they can afford to buy a house, for example, or whether they be able to pay for their kids to go to school.
I think the EU is a great example of politics that’s slow, but not too slow, and not a nightmare. Yes, this took years, and the discussions probably weren’t all good, but the end result is decent, and that’s what counts.
Other examples are RoHS (https://en.wikipedia.org/wiki/Restriction_of_Hazardous_Subst...), the GDPR (https://en.wikipedia.org/wiki/General_Data_Protection_Regula...), and roaming regulations (https://en.wikipedia.org/wiki/European_Union_roaming_regulat...)