This is not at all what RPCs were. And plenty of frameworks use "isomorphic javascript" (i.e. Javascript on both the front-end and the backend) -- Next, Nuxt, and many others.
Thank you for the correction, apologize if I muddied the waters. I didn't use meteor and only saw it from a distance. I do however use Next/nuxt/etc, and you're right that SSR/SG is a good counter-example to my point. I will say that outside of SSR/SG, isomorphic javascript isn't used that much in my experience. But it is a great counter-point for sure.