Wat
Don't get me wrong, new races absolutely are a burden on the team, but that workload doesn't really impede work elsewhere on the game because it's just not the same people working on these different areas.
Besides, unless they implement a drastically different body archetype akin to a truely beastial race or something with a unique limb arrangement like Lost Remnant's Sovani race they can just use the existing bone structures and item setups that we have already, EG Ivalician Moogles or Loporits would largely share assets with Lalafell.
As to comments saying that SE should be focusing on mechanics, roles etcetc. This isn't FFXI, races are almost entirely aesthetic alone now. Raid designers aren't having to take into account Lalafell vs Roes.
So personally, I'm of quite the opposite angle. Keep the new races coming. It's the lowest effort way to add an entirely fresh spin on the game for many++