easy to understand and use for everyone. you no longer need to spend tons of time teaching junior devs how to use git. By default mercurial also doesn't let you change history. There's no staging area or indexing before the commit. The gui and commands make total sense to the layman.

Git is definitely more powerful but causes more damage than good and wastes more time in most workplaces who are just looking for some simple version control and branching/merging features.