I'm honestly glad Linus learned to tone down this kind of talk or at least reserve it for situations in which it is more merited.
Because while in the majority of instances he was correct, he left a lot of folks feeling like The Dude from The Big Lebowski.
You're not wrong, Walter. You're just an asshole.
For a long time it was a particularly hostile environment to people trying to learn the ropes of open source contribution.
However, on the flip side, I am also glad he hasn't turned it off completely, because while it is important to foster a welcoming and inclusive environment, sometimes creating that welcoming environment involves sternly telling someone off about their behavior, when that behavior is unwelcoming or generally unhelpful.
Anyway, applause for Linus for showing emotional and social growth.
In the email chain subsequent to this exchange Linus even addressed the fact that the contributor would be better off learning about kernel development by focusing on the removal of unnecessary code and clean up.
No one jumps into kernel development knowing everything.
Maintainers need to teach people, not just about the culture and ethos, but about best practices and Linus had taught people constantly.
He has also learned a lot from others. To suggest otherwise is to think that Linus knew everything about kernel development back when he first began Linux development.
It absolutely is. It's not the place to learn the basics obviously, but members need to learn what is expected of them, just like on any other team/organization.
Linus's outbursts absolutely hinder growth. He's lucky that his project has become so important and people will work on it regardless, but he and the Linux kernel would have been better off if he was wasn't driving people away as much as he was.