As an engineer writing OCaml (and Rust too), I don't find any of this stuff to be a pain point. The syntax is fine once you get used to it. Anecdotally one of my colleagues who is learning OCaml and contributing to the code is using an AI to help get the syntax right and that works for him. Types in Rust are way more complicated and obscure than the ones in OCaml.
The ecosystem stays out of the way as much as possible - we are mainly interested in interfacing with C code directly, and OCaml (and Rust) make that pretty easy. I've been writing this project for over a decade and the language has been reasonably stable (OCaml 5 made some changes to the C interface, but we coped). Rust actually causes far more code churn - there's virtually a monthly cycle of some Rust compiler update requiring changes to existing code.
The ecosystem stays out of the way as much as possible - we are mainly interested in interfacing with C code directly, and OCaml (and Rust) make that pretty easy. I've been writing this project for over a decade and the language has been reasonably stable (OCaml 5 made some changes to the C interface, but we coped). Rust actually causes far more code churn - there's virtually a monthly cycle of some Rust compiler update requiring changes to existing code.