They are low overhead--when they aren't saturating your release schedule. At the end of the day, Square still has to propose, plan, oversee, publish, and wrangle with contracts on the platform end.
I'm willing to bet that Square's busy schedule has negatively affected some component of XV along the way--but if you're not, then that's fine.
And anyone who thinks Square hasn't been xenophobic (look up the word if you don't know what it means--I'm not calling them racists) until extremely recently hasn't been following them very closely. Square was a revolutionary, risky company from 1987 to 2001--and then they retreated into this stagnant, holier-than-thou shell for ten years that nearly bankrupted them. It was Eidos and Yoshida that catapulted the company back into reality.
Square is releasing games on Steam, allowing you to pay for FF14 with actual money, releasing demos, and giving players surveys asking how they can make their games better now. Six years ago, these simple things were anathema to Square.