Earlier quoted context omitted.
He probably means in terms of general usability. This is the reason why I don't use bitbucket at all, and I'm happy to give some money to github in exchange for their service. Bitbucket's issue tracker is such a pain to work with. I remember being redirected to a new page whenever I had to create a new tag. Then I'd loose the content of the issue I had started to write, something like that.
you are doing it wrong. If you want issue management you will buy Jira from the same company which is superior to github. Bitbucket is one tool of many for Atlassian.
(Similarly, VS Team Services has only one issue tracker and I'd rather use that than both of Atlassian's offerings, even though it's almost equally maximalist with Jira, mostly because they clearly dog food it and don't try to upsell into it from a worse system that nobody wants to use.)