Regulations can also be much more easily (and quickly, especially in the face of large changes in executive or congressional personnel/party/attitude) reversed,

Regulations can also be much more easily (and quickly, especially in the face of large changes in executive or congressional personnel/party/attitude) reversed, amended, or removed. The "rules" (mostly per-dept) mandating gradual phase-in, discussion, and phase-out of federal department regulations are much more likely to be bent and/or broken in the face of political sea changes. Not necessarily a good thing, but should be noted nevertheless.