[iex_xei]

That's true for me as well, but I learned these after many failures. Now, I start by writing enums and structs for the problem, then iterate the design with functions and if it's really needed add these functions as impl of a certain struct/enum. This is the inverse of "Object-Oriented" design where one has to start from interfaces and manipulate data to satisfy the interfaces.

[wvh]

Sounds like Go. Just write code, then see if any obvious interfaces pop up and if you need them.

[iex_xei]

I wrote servers in Go as well, and I like the language. After Rust, I believe at some point, I enjoy to solve the "problems" Rust brings, not that it's rationally better than Go.