Honestly, I take the opposite view - to me that's one of the best changes they've made in ages and I'm glad it propagated to old.reddit as well as showing up in new reddit; it's been an occasional frustration to hit 'hide' by mistake on something I wanted to see, then need to navigate to the far corners of the profile just to un-hide it again was always extra-silly. Next up maybe they can turn off auto-hide when reporting a post.