The real breakthrough here is that with this technique you don't have to crystallize the proteins anymore, which is the biggest bottleneck in X-Ray Crystallography.
Relevant; they used Cyro-EM to elucidate the structure of the SARS-CoV-2 Spike protein [1], which is a big step towards the development of a vaccine. This is a resolution of 3.5 ångström, but still a very nice feat.