This page from Jan 2022 suggests average fund returns over the previous
15 years (so that did include the bear market 2008, at that point, the article mentions) for "U.S. Large-Cap Stock" was 9.73%
https://www.thebalancemoney.com/what-is-the-average-mutual-f...
It does note that that includes "the average for all mutual funds, including index funds." But if the answer is "oh yeah, the index funds bring up the average a lot"... why would anyone use anything but an index fund?
Is it going to be a lot lower than that over 20, even though that already includes 2008?
I admit this is all pretty confusing to me.
What returns would you consider acceptable over 10-20 years? Or do you not even look at past returns when deciding whether to keep your money in a given fund, or invest in a given fund?