XenForo has 5 profile tabs (including resources) by default. If more than 2 extra tabs are added then tabs will break into multiple rows which doesn't look good.
Once I am ready with porting my addons, I will have 3 rows of tabs.
This could be solved by adding drop-down functionality to profile tabs. This way a lot more information could be added to profiles.
For example: Most profile tabs that addons add are for postings through the addon. Like gallery or resource postings. Such content would fit well under the 'postings' tab if that tab could have a drop down function added to it.
Similarly, if a dropdown could be added to the information tab, then addon developers could add plenty of goodies here as well.