The point is that reducing the friction required to contribute to an open source project is a great way to attract new contributors. Using more user-friendly dev tools is a great way to do that, and is therefore something existing maintainers would be wise to consider doing.
Yes. Because that's true. Either you have a good point and manage to convince people in the project, or you have to fork.
Writing irrelevant comments on some news site is not going to convince anyone to spend a combined hundreds to thousands of man-hours work (at the very least) to move kernel development to GitHub or whatever platform you like.
Also notice how you are ranting about tooling in a project you're not contributing to, while the submission here is about something entirely different -- and written by a contributor.
So you're saying we shouldn't discuss this at all? Just shut up and stop trying to convince anyone to adopt a viewpoint I believe would be beneficial to open source projects in the future?
IMO open discussions like this are a good and healthy thing for any community of developers (such as the one on Hacker News) to have. It's a great way to share ideas with each other and collectively come up with ways to improve the open source community. It's not something that should be discouraged.