Having worked with markup technologies for more than a decade spoiled me.
No, I don't want to maintain technical documentation in a clumsy Confluence that changes UI and functionality every other day.
I want vendor independent extensible semantic markup that covers my use-case. That I can turn into PDF, HTML, Excel and what have you.
Want an example? I'm cross-referencing a lot.
I define core functions of our discovery system that I refer to in different contexts. I.e. Emergency Planning, incident management, API usage, data protection, ...
Sure, I can insert links. But how do I check if e.g. every core function is discussed in the emergency plan and vice versa, if the emergency plan discusses all current core functions?
Heck! I'm very tempted to whip up a plain ol' XHTML file. Add a grammar and Schematron rules and focus on the hard part (documentation).