Board Thread:The Panopticon/@comment-6032121-20190914173756/@comment-24048868-20200904142002

Also of note is that the introduction page, albeit not part of the narrative, refers to:
 * The Emperor. The almighty leader of the Daleks - The Doctor's greatest enemy - his golden battle armor portrays his royal superiority. Merciless, the Emperor strives for universal domination.

So that at least shows intent in that it implies the existence of non-battle armour for this same Emperor in other appearances, such as in Evil. I suppose it's just more comfy in there.

Also, apparently the Dalek Prime Strategist is older than the Emperor, but that's only by his own reckoning.