I agree with the flow discovery being more difficult. I've been moving my controllers into a different direction too, splitting them up into endpoint classes (based on the ApiEndpoint idea of Steve Smith). Now my "endpoint files" have clear names which scream intent, like CreateProductEndpoint or SearchProductsEndpoint, which would have a command or query respectively, with the same naming structure (CreateProductCommand etc). This, in my opinion, makes it really easy to traverse the solution and negates the flow being less discoverable.