Hard disagree. Rust lets me move much more quickly in many scenarios. I wouldn't want to prototype in Python for example. In my experience I'll spend too much time debugging and dealing with typing issues if i did that. Even with type hints. Having solid tooling that I can trust to help me maintain quality while moving fast and a really good ecosystem makes Rust a good choice
Depends what you're prototyping. Rust is hard to beat for prototyping an interpreter, for example.
Ah… part of the process is having fun. If ppl enjoys rust, then rust is fine :-)