why not use git rebase instead of git merge in dlang repos?

[Timothee Cour]

There are lots of articles on this topic, eg:
https://blog.carbonfive.com/2017/08/28/always-squash-and-rebase-your-git-commits/
(note that squashing down to 1 commit shouldn't be necessary but at
least rebasing should be done)

github UI also allows to rebase (instead of merge)

would really simplify things like visualization / understanding
history, git bisect. It shouldn't matter at what commit was a feature
started, only thing that matter should be when it was incorporated
into master.