Theory behind well tempered tonearm?


Hello Goners.
I am curious on the Well Temperd tonearm alignments.
In the normal pivotal tonearm, the S2P distance is fixed, and follow is the offset angle at where the cartridge is fixed to reduce the most distortion when we mount the cartridge correctly by using the appropriate protractor.
Now comes the Well Temperd, the pivot is the ball half sunk in oil and hung by the strings. That means the P2S distance is not fixed. Offset angle is fixed (because the cartridge is mounted on the headshell). So, distortions are almost appeared everywhere. Why Well Temperd owners never complain about it. All I have read online are the sound is smooth and accurate.
Why so?
dangcaonguyen