"Speedsters are boring, they're useless they just run fast."
Wrong!
Jay Garrick can make sonic bombs by just hitting his helmet at the right frequency. Barry Allen can disassemble and reassemble himself molecule by molecule at will. Wally West can freeze a person in time by removing their potential kinetic energy. Bart Allen can trap entities between molecules. Eobard Thawne can age someone to dust with a touch. Literally any of them can throw a grain of sand with enough force to go through any armor you care to imagine. Speedster abilities are not only endlessly creative, they're horrifyingly OP.
Eobard: “No matter what you do, Y/N. Barry will always choose Iris over you. In the grand calculus of the multiverse, they are endgame. Destined to always find each other. You're just a stepping stone in their glorious love story.”
Y/N: “Well, destiny's about to get a rewrite because I'm not letting him go, and I don't care what you say. This time it's different.”
Eobard: *Smiles* “Don't say I didn't warn you after he breaks your heart.”