I suspect there are some misunderstandings here about the "dreaded donut". It's important to understand that this problem arises when reloaders outside turn their case necks to fit tight chamber necks. It doesn't happen with unturned necks or with no-turn or larger chambers necks.
Therefore, there is no need to worry about how deeply a bullet is seated into the case if you don't have a tight neck chamber or original brass that wouldn't fit the chamber in unturned sized condition.
Yes, I know that some brass creep happen, and brass can develop the problem over time, but it's a mistake to think that it always happens or that the donut is inevitable.
Seating bullets out past the neck shoulder junction has the advantage of increasing the apparent chamber size to increase charge volumes and velocity, but it's not a major advantage.
Nor is it a significant disadvantage to seat bullets deeper into the case than the neck shoulder junction. The reduction in case volume is not really that significant.
It is much more important to seat bullets to achieve optimum throat position relative to the lands and maintaining adequate bullet retention with enough of the neck to hold the bullet securely than it is to worry about where the bullet's base is relative to the neck shoulder.
Even for those shooters who do have tight necks and neck turned cases, careful attention to the neck turning process and returning if ever necessary is a much preferred approach to the issue than arbitrarily setting the seating depth above the neck shoulder junction.
In my experience, the problem of too long a throat and bullets too far from the lands, and loads that are too long to fit the magazine are MUCH bigger and much more common issues than the donut is.
Last, but not least, bushing dies can also eliminate the problem by limiting how much of neck is sized to keep it away from the neck/shoulder junction.
