You're new here aren't you?

> Why must a generaly good improvement these days always start on HN with "rewrite in rust" like it's the only language which still matters.

I'm guessing so that its likely to 1) be safer by default, 2) likely to get more contributors, 3) more likely to work cross-platform, and 4) more likely to get attention and survive as a project.

"memory safe by default" but not necessarily "safer" by default. A code base that has been battle tested in production for decades will likely be safer in every other way than an entirely new project that has got thrown up on a git repo yesterday.