I like the nomenclature for certain articles. I grew up, like I suspect many of us did, excited about things like the F14, B52, etc. I don't think everything needs it, so I'm okay with the use of 'discourage' and letting the submitter/reviewer figure out if it makes sense. Sort of a, "if the nomenclature is part of the name you want people to use, then include it in the title - otherwise, it lives in the stat block" kinda deal.
I think factions should have some leeway with how they want to name their articles. So long as they're consistent, there is some flavor in the decision to use or not use nomenclature, nonstandard text arrangements, etc in titles.
That in mind, if Yamatai would like to bar the use of nomenclature in all the titles for their articles, you've got my full support. In addition to the 'discourage' idea.