There are many references to just that. One of the main points of filing later especially if there are fixed incomes and taxes will always be a factor, is to USE the money that is in pretax accounts, that you saved & invested, to provide a higher income now and later with tax reduction. Using those funds serves three purposes -taking advantage of the lower income on no SS which should be a lower effective tax for those dollars withdrawn, reducing future RMDs so that one is not forced to withdraw unwanted funds at a higher rate, and increasing the amount of SS income that is tax free (many states) and advantaged (85% taxes at most). Sure, the amounts are not huge, at most about $20k/yr, (for a max SS income individual, with an about $250k reduction of pretax tIRA) but that $20k can end up with a differential in equivalent NET proceeds (after 70) compared to taking at 62 of as much as $5-6k/yr, which increases with COLA adjustments.
The other side of the coin is that some believe they can earn more net after tax long term by hanging on to that $250k, so the tax advantages are negated by the earnings. One doesn’t care if you pay more taxes as long as the net is higher after all. But you have to do a lot better than 4% net inflation, just to reach that level and that ignores the survivor benefits of increased SS, and has to be consistent your entire life, so ignores the sequence of risk factor as well.
There are scenarios on boths sides that for each it is a no brainer. There is no single right answer.