Because I have never had to do it. All projects I’ve worked on the last decade were on github or gitlab. And prior to that on subversion and mercurial we just

Because I have never had to do it. All projects I’ve worked on the last decade were on github or gitlab. And prior to that on subversion and mercurial we just would merge branches locally. Back in the 1990s I used sourcesafe which had file locking checkouts and when I used sccs I was the only contributor.