I would guess probably just a more mixed approach at most, something like the lua-humanoid demo we saw with the Avatar Evolution studio build. Still lua, and still moddable, but assisted slightly by some helper instances.
Or it’s just not that.
Roblox didn’t have lua chat originally, then they invested a lot of time and effort (and still do) to make the lua chat function well, so, I don’t see Roblox turning that precedent around randomly.