The mutual fund statements that I receive tell me the dollar amount my investments have changed. I think this is useless information, at least the way it is presented.
Saving for a major goal, such as retirement, requires a number of calculations and assumptions (e.g., about rates of return, amount saved, amount accumulated at retirement, income during retirement).
What I would find helpful is, how exactly am I doing according to my plan? Better, worse, or on track? And why? Then I can take appropriate action: adjust my retirement income forecast, adjust my investment assumptions, modify my investment strategy, adjust how much I save, or decide to stay the course.