Why we still need StandingPlayRate since we've matched the speed to animation?

[ameaninglessname]

Now that we've matched these two by the "StrideBlend_N_Run" series curve, why do we need to adjust the play rate by "Grounded.StandingPlayRate "?

Code segment

// Set the Walk Run Blend
Grounded.WalkRunBlend = CalculateWalkRunBlend();

// Set the Stride Blend
Grounded.StrideBlend = CalculateStrideBlend();

// Set the Standing and Crouching Play Rates
Grounded.StandingPlayRate = CalculateStandingPlayRate();
Grounded.CrouchingPlayRate = CalculateCrouchingPlayRate();