Don’t know how hard you may have hit the curb but oftentimes going over a curb hard enough can translate into strut tower damage. If that were the case it may take the frame bending machine to bend the strut tower(s) and/or frame back into spec. I don’t know how that could make steering more difficult however. Seems like a steering issue would be caused by steering related components, not suspension components necessarily. But maybe you could ask them to inspect the strut towers for warpage during their inspection. Another way to tell is to see if the gaps between top of tire and fender are different. But the difference may be very slight. If repair is needed on these components it may get very costly and you might need to file an insurance claim. Good luck.