> Do we need that flexibility?
Yes.
> The flexibility to extract a settlement from guilty people without an acknowledgement of guilt seems to be a worthless prize unless we’re enforcing legislation for revenue’s sake.
Civil charges are about liability, not guilt, and have a different standard of proof than criminal guilt. However, in a criminal trial, and admission of facts necessary for civil liability is admissible evidence. No one benefits from a system in which it is impossible for a party to accept civil liability without admitting to facts that could be used against them in other, including criminal, litigation when the civil verdict itself could not be.
And, while in this case all of the consequences may have been monetary, in civil litigation especially involving the government, there are often other consequences (such as legally binding commitments to heightened monitoring and behavioral controls) that are attained in settlements (often, in the form of “consent decrees”) of civil litigation. Making those more expensive for all sides because the defense was incentivized to go through a kabuki-dance trial even if they fully expect to lose on the civil burden of proof just to avoid making an admission to settle does not benefit anyone. Except lawyers, lawyers would love it.