Chat Text Bubbles over Player Characters?

[BrachyXIV]

There is a finite limit to the number of entities they can draw on the screen at once, and the total number of all entities, optional or otherwise, needs to be less than this number. This is an actual reason they have cited in the past for not adding features like special indicators on hotbar button corners or item icons.

But they haven't even gotten draw priorities right for mobs and party members yet. I'd hope they spend time fixing that before adding even more drawables over the limit that might be wrongly prioritized over more important drawables.

I want to see where they say this. Where is this limited number you speak of and how is it any different from an NPC speech bubble regarding what can be "drawn" if it is already in the game but for NPCs