I don't know, but this Morningstar article from 2013 says...
"Even though personal rates of return are crucial numbers for any investor trying to reach a goal, few fund families provide these returns on investors' account statements. Why not? Many fund companies brush off any suggestions for improved disclosure by arguing that providing more information would only confuse investors, or by pointing to surveys showing that shareholders are satisfied with the status quo."
https://www.morningstar.co.uk/uk/news/65362/understanding-yo...
In any case, for me, the PRR is the best measure I know to understand how my portfolio is performing. I don't think it's confusing... if my PRR is 10%, it means that a fixed-rate account with a 10% APY would have provided the same returns when applying to it the same cash inflows and outflows as my investments. I think that effectively communicates the performance of the portfolio (and lets me compare it with other portfolios, or particular investments).
