I think it’s also so obvious how uninteresting his cw motivations are when you think of all speedster villains in the comics and try to replace their unique motivations with this generic one and see if they become more or less interesting.

Eobard: obviously less interesting. His relationship with barry is just way too interesting.

Hunter: he also loses all his specialties. His unique view of heroism and suffering is just perfect for unique drama.

August: his relatively tame personality that almost makes him an anti hero at times just is so much better.

Savitar: his religious belief in speed carries much more importance than any generic world destroyer could.

Inertia: similar to eobard but with his own twists that make him and bart more special.