Alexadamz
Warlord
I think the issue is more that Ottomans had a lot going on that wasn't just domination related (think of the furniture!) so there's some desire for some acknowledgement of that in the design (something science or culture related), especially given they were also pretty much a pure dom civ in 5 as well. Something of the same with people wanting say Kublai instead of Genghis for the Mongols.
I don't think anyone expects the Zulu or Alexander, the Civ, to be anything but domination.
Besides, if they are focusing the leaders more for Civ VI, an Ottoman Dom focused civ would be best with Medmed II than with Suleiman. The first is the Conqueror, and the other is the Magnificent, although they used his Lawgiver epithet as his Agenda.