Fastify has, IMO, a better Typescript story than any other framework, particularly with Fastify 4. I also prefer Fastify's ergonomics around plugins as scoping

Fastify has, IMO, a better Typescript story than any other framework, particularly with Fastify 4. I also prefer Fastify's ergonomics around plugins as scoping to Koa's Connect-derived approach, and I don't really love having a `ctx` object as opposed to req/res (but that one is purely a taste thing). For me, if I wanted what Koa does, Express does 90% of it and I already know it off the top of my head. And I don't really want Express because I'll have to reinvent a lot of wheels or stack a lot of sorta-compatible middleware on top of one another (Fastify's ecosystem is smaller but generally pretty cohesive). Nothing at all wrong with Koa, to be clear--I just don't have a use for it.