Every story does not have to appeal to you. If you don't like seeing a a buff omega top then dont read a story about a buff omega topping. The omegaverse is fictional and the specifics of omega and alpha characteristics have always been at the discretion of authors to alter and adjust. There are many stories where omegas, betas and alphas bodies, heats and traits can work differently, it just depends on the author. There's hundreds if not thousands of stories with submissive and petite omega ukes, if this isn't your cup of tea then go read those instead