I have thought about this (is my algorithm for liking/hating stuff deficient?), but am not certain if it is because I use a later version of JIRA, or if it is me. Am I less sensitive to bad web UIs?
It is easy to communicate with users and other developers. It keeps the discussion on the tasks in a nice place. It is easy to add queries to other people to call them in to touch a task.
My main theory is that the use case is different; I have more to do with users for the present tasks and the more complex features are less overkill. And I see less of the horrors (more experienced admins).
(Jokes about that this just shows my mental deterioration with advanced age will not be appreciated. :-) )