It wasn't when this codex was released. Now that it is, you may as well put a bolter with a power fist as you're not getting the extra attack anyways.
In a directly aesthetic decision I made my Tactical sergeants all have bolters and chainswords. Useless, I know. Cool looking? Aw yea. If only chainswords were AP6 at least...
Power Fists have prevented the bonus from 2 Close Combat Weapons for about ten years now, so I can't support the "Wasn't when the codex came out" issue. As for the pistol, yes, it supports firing then charging, but cuts a shot out during Overwatch. I usually equip with Power Sword, Bolt Pistol, and Melta bombs for my Sgt. builds.