Its around 98% that plea out in the federal system, but most federal criminal cases aren't notorious, high-profile, mass impacts fraudsters that the feds have dead to rights because the defendant not only decided to publicly recount many of their offenses as a coping mechanism as their scheme fell apart, but also have a bevy of top co-conspirators already pled out and ready to testify against them.

The Feds had no sufficient incentive to agree to a lesser set of charges, and SBF had no incentive to plea guilty to the exact same set of charges he could instead demand that the government prove beyond a reasonable doubt, which at a minimum would delay the process.