You're diverting from the context of this thread. I'm asking why a developer who is comfortable with Rust borrow checker choose any other language? How is a GC language preferable in any way to Rust for such a person?

In a broader sense, I keep seeing some people asking everyone else to avoid Rust based on an exaggerated account of the struggle with the borrow checker. There is actually a way to get comfortable with the BC. Perhaps beginners should be introduced to those ideas rather than such negative takes.

> I'm asking why a developer who is comfortable with Rust borrow checker choose any other language?

Because there are other languages which don't require you to hold to a strict set of rules to maintain memory safety, as they automate memory reclamation at runtime.

> There is actually a way to get comfortable with the BC. Perhaps beginners should be introduced to those ideas rather than such negative takes.

Regardless of how comfortable you are with it, it imposes a necessary overhead, either in terms of architectural constraints or the runtime cost of reference counting which is greater than that of garbage collection.

> I keep seeing some people asking everyone else to avoid Rust based on an exaggerated account of the struggle with the borrow checker.

The borrow checker is irrelevant here. As you have mentioned, a person coding is C will have to keep to the same constraints which Rust statically enforces. There is clear reason to use a language such as Java over C. Not having to manually manage memory simplifies code and makes refactoring easier. This is true regardless of if your memory restrictions are checked or unchecked. Imagine the simplest example: a data structure containing a string. In Java, you write a class and put a string in it. The data for the string is shared and a simple copy of the pointer will suffice in the constructor. In languages with manual memory management, you have three options: the struct can own the string (or reference count it), in which case it will have to be cloned and performance will be worse than garbage collection; the struct can borrow the string, in which case you'll have to track the string's lifetime throughout the program which could cause issues later; the structure can be generic over owned and borrowed string types, in which case code will be more complicated and generic parameters will proliferate. It should be immediately apparent that the latter requires more architectural consideration than the former, and hence is a greater burden to programmers. Several of the options in the Rust case will also lead to potentially complicated refactoring later, which adds even further cost to development.

TL;DR managing memory manually takes more effort. That's why it's called MANUAL memory management, because it's not automated.