It's not a barrier, per se. I simply realized after working with it for a little that all the server is doing is creating a container and links to the JS, not rendering the page, and finding when it switched SSR to CSR wasn't immediately apparent.
Now I know that the default React SSR is super basic and doesn't contain any real content. Now I have another avenue to explore.
https://void.cat/d/Ag5kH4Rd8633AMjEwpL7sR.webp
(I didn't realize at first this only ran on the client. I thought this was server-side)