Downright routine for the very top players now as a matter of self defense. Probably very sensible to have at least some options/variety once you reach a level where your games are in databases and opponents have the opportunity (time and warning) to really prepare in advance.

I tend to overhaul a chunk of my repitoire every year or two. More to keep myself interested than anything else though.

Am I the only one here who is constantly changing what openings they want to play, or who is indecisive about what to play? I can't seem to make up my mind about whether to play the Najdorf or 1...e5, and within 1...e5 I can't decide between the Archangel or Breyer. Anyone else have this problem?