Policy analyst: Most government agencies become less effective over time. Some experts go so far as to recommend that every agency be eliminated after 10 years and created anew by replacing all of its existing personnel and revamping its bureaucratic structure. However, this policy would be impractical since certain government agencies perform vital functions, such as protecting national security, and therefore cannot afford even temporary upheaval.

The answer mentions first statement as evidence to me it seems like a opinion .Can anyone elaborate