When you create a pull request in Bitbucket you can select the option to "Close Branch" or if you did not select that option when it was created when it is merged you can chose to "Close" it at that time too.
However, by selecting to close the branch does absolutely nothing to the branch in any interface except for Bitbucket. So I am not going to ask Atlassian why they do not delete the branch. What I want to know is, what is the benefit, to me the end user/customer, does this purposeful design option provide? Because all I can see is that, it just clutters up the branch lists in SourceTree and cause me to do additional "work" that, frankly, I do not understand why I should be doing it anyway.
Because Bitbucket does not delete the branch, what is the suggested method for deleting these branches and how long should they be kept? I assume that you have a automated process for "cleaning" up these after the assigned duration that they should be kept. So if you would please provide a link to that documentation, that would be great!