Let’s make it simple - having a diverse and welcoming community makes a project more attractive to contributors, and means that it’s more likely to succeed in the long term.
Sure, I never argued against fostering a welcome environment for contributors. We need more of this especially in open source, where contributions can be sorely lacking.
Instead I question the notion that Rust needs to have some sort or diversity to succeed. The assumption that it does implies that without diversity Rust will fail. However, Rust is not particularly diverse at the moment and it is certainly successful.
Are contributions currently being rejected based on personal traits?
I think the answer to this question would help me a lot in understanding any of this.