Yeah I guess so, it still seems like it could be a major pain. Especially if somebody, say, transferred money between wallets and didn't keep good records. Or messed up the cost basis somehow. Or didn't think to set aside the necessary taxes every time, and then finds themselves with an unexpectedly large tax bill at the end of the year.
It's another reason why using a cryptocurrency is still a gigantic hassle in comparison to fiat.
Isn't that trivial to do from a reporting point of view? Just export your wallet history and do a lookup on that day's price.