1) I had no ideal imagined outcome to writing that comment. The parent asked what the GP meant by not liking Rust but that at least Rust could be compiled by gcc. I was just explaining why it may be preferable to someone that does not use (or in this case "like" Rust) to see it able to be compiled by a GPL piece of software that has been a part of the Linux core for almost all of Linux's existence. As to the rest of that question, of course, I don't think that anyone using/enjoying/designing/supporting Rust in any way would be convinced by anything I think or say (I'm just some guy on HN).

2) If I had the power to change what? The issue with Rust not being able to compile using gcc or more broadly concerning change things regarding Rust? I don't think a list of changes I'd make to Rust is what you wanted, so I'll assume you meant regarding compiling Rust via gcc. If I had the power to change Rust from being only compiled using rustc and moved to primarily gcc based I would. And the why is not particularly interesting, I will always prefer actions and decisions that take mind and market share away from anything that can be used to advance the interest of multi-national conglomerate corporations via permissive licensing of the core technologies of computing.

I know that is not a technical argument, but it is the reason I'd make the change. I will assert that such a reason is absolutely valid, but I don't take disagreement with my position to be a character flaw in someone.