JIRA and Confluence...
Many things are arbitrarily complex. But Atlassian constantly gives items of differing importance the same level of attention, in a shotgun blast of UI.
+1000 to JIRA as a response to this. I'd probably support confluence here too but every company y I've worked with killed it one the WYSWYG editor became mandatory and all of engineering refused to use it.
It's a pain to use.