Exactly as the title says. I feel there should be a way to view campaign missions we already completed.
For a few reasons:
1. If a player leaves the game for an extended period of time and choses to come back at a later date, they may have forgotten what has happened in the game. In that case, this can be useful to help jog their memory.
2. Glitches. I am pretty sure that I experienced a glitch that caused some dialogue to skip in the Murkwood Campaign. For that reason, I wish I had the ability to go back and revisit that chapter.
3. Some people may want to replay the campaign just for fun, to try to find alternate dialogue options, or even to help create theories about the game.