The ability to merge routers that have different contexts into one client. For example a Fastify tRPC server + a Next.js tRPC server that have different purposes, but both need to be consumed by the Next.js app which is not possible at the moment.
KATT mentioned that really only error formatting needs to be the same, so some new merge routers method that merges any two routers as long as their error formatting is the same.
The only workaround I can think of off the top of my head is calling the secondary server (in my example, the Fastify server) with
createServerSideHelpers and then proxying it with a new router inside the Next.js server, although this adds unneeded latency and complexity.
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