It's a good idea in theory, the perf just needs to be better. Maybe with bun.
I'd be shocked, given that the bun team has shown a ton of maturity in all their messaging as far as API compatibility, engineering chops, and attention to detail. Nothing I've seen suggests that they'd be sloppy on the security side.
Or you can use React Query/Tanstack Query, not waste cycles and bandwidth on RSC, get an app with better UX (http://ilovessr.com), and a simpler mental model that's easier to maintain.